I would advise, that if you have time, start from scratch. Yes, the old Registrations convert just fine, but I sometimes fall into the trap of trying to make the new keyboard sound just like the old one, in the interest of time.
I have done a mixture with this one, using my existing registrations as a starting point, then adjusting, changing styles, changing lead setups, etc., as I go along.
Keeps a boy busy and out of trouble.