Undo e.setExternalId(null) in cleanupForComparison

application/src/main/java/org/thingsboard/server/service/sync/ie/importing/impl/BaseEntityImportService.java

@@ -160,7 +160,6 @@ public abstract class BaseEntityImportService<I extends EntityId, E extends Expo
 
     protected void cleanupForComparison(E e) {
         e.setTenantId(null);
-        e.setExternalId(null);
         e.setCreatedTime(0);
     }