Personally I'd say, copy all the data files and restart the mysqld. If I'm correct this would add users, add databases and the data contained in it.
So, I'm talking about the /var/lib/mysql and the files/directory's in it.
My best guess would to tar it (don't forget user permissions), transfer it and untar it. But I do recommend shutting down the MySQLD on both servers before tarring/untarring it. Also, you should test it
As for DA, I am not completely sure if it would work, I have no real idea how the user databases are connected to the databases/users themselves. So best guess is to wait until someone who knows a bit more is able to respond...