diff --git a/packages/react-native-compatibility-check/src/TypeDiffing.js b/packages/react-native-compatibility-check/src/TypeDiffing.js
index abd3310fe1d..405b21e1d80 100644
--- a/packages/react-native-compatibility-check/src/TypeDiffing.js
+++ b/packages/react-native-compatibility-check/src/TypeDiffing.js
@@ -12,6 +12,7 @@ import type {
   ComparisonResult,
   FunctionComparisonResult,
   MembersComparisonResult,
+  PositionalComparisonResult,
   PropertiesComparisonResult,
   TypeComparisonError,
 } from './ComparisonResult';
@@ -905,7 +906,7 @@ export function compareStringLiteralUnionTypes(
   olderType: StringLiteralUnionTypeAnnotation,
 ): ComparisonResult {
   const results = compareArrayOfTypes(
-    true, // Fixed order
+    false, // Fixed order
     false, // Can grow/shrink at the end
     newerType.types,
     olderType.types,
@@ -928,28 +929,30 @@ export function compareStringLiteralUnionTypes(
           'Unexpected inline objects/functions in string literal union',
         );
       }
+      if (
+        results.addedElements.length <= 0 &&
+        results.removedElements.length <= 0
+      ) {
+        throw new Error('string union returned unexpected set of changes');
+      }
+
+      const changeLog: PositionalComparisonResult = {
+        typeKind: 'stringUnion',
+        nestedChanges: [],
+      };
+
       if (results.addedElements.length > 0) {
-        return {
-          status: 'positionalTypeChange',
-          changeLog: {
-            typeKind: 'stringUnion',
-            nestedChanges: [],
-            addedElements: results.addedElements,
-          },
-        };
+        changeLog.addedElements = results.addedElements;
       }
+
       if (results.removedElements.length > 0) {
-        return {
-          status: 'positionalTypeChange',
-          changeLog: {
-            typeKind: 'stringUnion',
-            nestedChanges: [],
-            removedElements: results.removedElements,
-          },
-        };
+        changeLog.removedElements = results.removedElements;
       }
-      console.log(JSON.stringify(results));
-      throw new Error('string union returned unexpected set of changes');
+
+      return {
+        status: 'positionalTypeChange',
+        changeLog,
+      };
     case 'matching':
       return {status: 'matching'};
     default:
diff --git a/packages/react-native-compatibility-check/src/__tests__/TypeDiffing-test.js b/packages/react-native-compatibility-check/src/__tests__/TypeDiffing-test.js
index 55e0a114fcb..e223644aaf9 100644
--- a/packages/react-native-compatibility-check/src/__tests__/TypeDiffing-test.js
+++ b/packages/react-native-compatibility-check/src/__tests__/TypeDiffing-test.js
@@ -1010,7 +1010,16 @@ describe('compareTypes on string literal unions', () => {
         nativeTypeDiffingTypesAliases,
         nativeTypeDiffingTypesAliases,
       ),
-    ).toHaveErrorWithMessage('Subtype of union at position 1 did not match');
+    ).toEqual(
+      expect.objectContaining({
+        status: 'positionalTypeChange',
+        changeLog: expect.objectContaining({
+          typeKind: 'stringUnion',
+          addedElements: expect.arrayContaining([expect.any(Array)]),
+          removedElements: expect.arrayContaining([expect.any(Array)]),
+        }),
+      }),
+    );
   });
 });
 
diff --git a/packages/react-native-compatibility-check/src/__tests__/__fixtures__/native-component-with-props-union-added/NativeComponent.js.flow b/packages/react-native-compatibility-check/src/__tests__/__fixtures__/native-component-with-props-union-added/NativeComponent.js.flow
index 2a4fcf90d8f..bf132c85480 100644
--- a/packages/react-native-compatibility-check/src/__tests__/__fixtures__/native-component-with-props-union-added/NativeComponent.js.flow
+++ b/packages/react-native-compatibility-check/src/__tests__/__fixtures__/native-component-with-props-union-added/NativeComponent.js.flow
@@ -16,7 +16,7 @@ import codegenNativeComponent from 'react-native/Libraries/Utilities/codegenNati
 
 export type Props = $ReadOnly<{
   ...ViewProps,
-  size?: WithDefault<'small' | 'large' | 'huge', 'small'>,
+  size?: WithDefault<'small' | 'huge' | 'large', 'small'>,
 }>;
 
 export default (codegenNativeComponent<Props>(
diff --git a/packages/react-native-compatibility-check/src/__tests__/__snapshots__/ErrorFormatting-test.js.snap b/packages/react-native-compatibility-check/src/__tests__/__snapshots__/ErrorFormatting-test.js.snap
index 05f5b3a3bc4..6cddfacb345 100644
--- a/packages/react-native-compatibility-check/src/__tests__/__snapshots__/ErrorFormatting-test.js.snap
+++ b/packages/react-native-compatibility-check/src/__tests__/__snapshots__/ErrorFormatting-test.js.snap
@@ -196,7 +196,7 @@ Object {
         Object {
           "errorCode": "addedUnionCases",
           "message": "NativeComponent.sizes: Union added items, but native will not expect/support them
-  -- position 3 huge",
+  -- position 2 huge",
         },
       ],
     },
@@ -237,7 +237,7 @@ Object {
         Object {
           "errorCode": "addedUnionCases",
           "message": "NativeComponent.size: Union added items, but native will not expect/support them
-  -- position 3 huge",
+  -- position 1 huge",
         },
       ],
     },
@@ -709,7 +709,7 @@ Object {
         Object {
           "errorCode": "addedUnionCases",
           "message": "NativeModuleTest.exampleFunction parameter 0: Union added items, but native will not expect/support them
-  -- position 4 d",
+  -- position 3 d",
         },
       ],
     },
@@ -725,20 +725,10 @@ Object {
       "framework": "ReactNative",
       "incompatibleSpecs": Array [
         Object {
-          "errorCode": "incompatibleTypes",
-          "message": "NativeModuleTest: Object contained a property with a type mismatch
-  -- exampleFunction: has conflicting type changes
-      --new: (a: (a | b | c), b: number)=>void
-      --old: (a: (a | '0' | '1' | 'a long string'), b: number)=>void
-      Parameter at index 0 did not match
-          --new: (a: (a | b | c), b: number)=>void
-          --old: (a: (a | '0' | '1' | 'a long string'), b: number)=>void
-          Subtype of union at position 1 did not match
-              --new: (a | b | c)
-              --old: (a | '0' | '1' | 'a long string')
-              String literals are not equal
-                  --new: b
-                  --old: '0'",
+          "errorCode": "addedUnionCases",
+          "message": "NativeModuleTest.exampleFunction parameter 0: Union added items, but native will not expect/support them
+  -- position 1 b
+  -- position 2 c",
         },
       ],
     },
@@ -756,7 +746,7 @@ Object {
         Object {
           "errorCode": "removedUnionCases",
           "message": "NativeModuleTest.getConstants.exampleConstant: Union removed items, but native may still provide them
-  -- position 4 d",
+  -- position 3 d",
         },
       ],
     },