When we change the source we need to synchronize the model (in CZ Gold) and then model refresh should work just fine.
Thanks for your reply. I would like to add here that, around one month back I changed the import source and ran synchronization and it did not work. It showed me errors related to organization id and inventory item ids not matching. But in last week, I tried this once again and it worked. Now I am wondering why it did not earlier. Nevertheless, for now its working for me.