After migration the site is still showing a fresh installation

I’m migrating some sites across from my previous host. Is there a way I can check the migration before I change the dns settings?

I have already done migration using the ftp method in your host and it went smoothly but after that when I tried to access the admin of the site I could not access it using my source sites credentials.

Also, the destination site is still showing the fresh site from before the migration. I have cleared object caching and refreshed the wp-config but that did not help. In the database it shows the source site users.