Please note that the current arrangers, starting from the Tyros 1/PSR3000/CVP309 use a different set of drums than the keyboards pre-2000, so yes, a lot of them will sound really weird if you don't remap, revoice, and assign a new reverb for the drums; *unless* you have expansion memory and the old PSR340 retropack drum installed on your keyboard, then you can at least get 1 of the pre-2000's kits for use in the old styles.
Probably simpler to just edit the reverb and drum kit to work on the newer keyboards though (when I bring old midis to post-2000 Yamaha arrangers, it often cuts off all the reverb, and for some reason, chorus was added to almost every track back then, which sounds horribly unnecessary on anything other than bass, ep's and synths; very lightly on *some* guitars. If you're not sure, set chorus dsp to 0!
Mark