You could probably just copy the row of that client from the database, and pop it into the other database... It should save all the info and transfer it over... Be sure to check the port though, so it doesnt collide if that ports already in use on the other server.
If they have auto DJ, you could transfer the music files over too, tar'ing them first, and then transfer from server to server, and then untar on the other server.
(This "COULD" work, but don't quote me on it.)