The exhaust lengths are the same. I have an 02 OBS and have an 93-01 Borla cat-back on my scoob!
....I also know that the 98-03 OBS's have drum brakes in the rear. The new 04's have disc.
You can do the swaps on the brakes on these cars and from what I have read seem to be fairly easy. I want to do this to mine someday so I shall see.