You can use the Blackberry Enterprise Transported Tool to migrate users from one Blackberry server to anther when the servers are using separate SQL databases.
In the below example I am migrating users between 2 separate versions of BESX.
In this example I am using new SRP and CAL info.
I recommend having a read of the below article.
Click on the details button to select the users to migrate.
You can then preview and run the migration.