Replication and Switchover

Howdy,

We have 2 databases running out of a single database cluster.  We would like to set up replication from the existing host to a new host and then switchover to that new host.  One of the databases is ready to switchover now while the other database is going to take a bit more time to be ready for the switchover. 

We would like to switchover the database that is ready now so we can start performing load testing against it.  Is it possible to switchover one database in a cluster while not switching over the other?

Thanks,

Sam