diff --git a/web/packages/core/src/public-api.ts b/web/packages/core/src/public-api.ts
index 8c0250bf1..0337d6751 100644
--- a/web/packages/core/src/public-api.ts
+++ b/web/packages/core/src/public-api.ts
@@ -62,15 +62,19 @@ export class PublicAPI {
         this.conflict = null;
 
         if (prev !== undefined && prev !== null) {
-            if (prev instanceof PublicAPI) {
+            if (
+                prev instanceof PublicAPI ||
+                ("version" in prev && prev.version == this.version)
+            ) {
                 /// We're upgrading from a previous API to a new one.
-                this.sources = prev.sources;
-                this.config = prev.config;
-                this.invoked = prev.invoked;
-                this.conflict = prev.conflict;
-                this.newestName = prev.newestName;
+                const previous = <PublicAPI>prev;
+                this.sources = previous.sources;
+                this.config = previous.config;
+                this.invoked = previous.invoked;
+                this.conflict = previous.conflict;
+                this.newestName = previous.newestName;
 
-                prev.superseded();
+                previous.superseded();
             } else if (
                 prev.constructor === Object &&
                 prev.config instanceof Object
@@ -276,8 +280,8 @@ export class PublicAPI {
         sourceAPI: SourceAPI | undefined
     ): PublicAPI {
         let publicAPI: PublicAPI;
-        if (prevRuffle instanceof PublicAPI) {
-            publicAPI = prevRuffle;
+        if (prevRuffle?.constructor.name === PublicAPI.name) {
+            publicAPI = <PublicAPI>prevRuffle;
         } else {
             publicAPI = new PublicAPI(prevRuffle);
         }