I think that would be "old sounds" by name only,but I would like to think that those "old sounds" have been improved for the 3700.
One thing that I noticed about the 3500's timpani over the timpani in my venerated WK-1350,is that it was rounder and "plummier".The timpani in the 1350,though usable(and ultimately,I got used to it) sounded more like a wet paper bag.
What I'm getting at is,it might have the "same old patch name" but hopefully,the ZPI sound has been improved yet once again over the 3500.