It would have to be a bolt-on, not a slip-on, to stand a chance of being swappable, and then, even if the pattern was the same, it would have to have the right clocking - which is why you can't use a 2001 bolt-on on a 2000 B12, because Suzuki changed the clocking.
If it's a true slip-on, it would come with a midpipe, and in that case, the odds would be against you they'd be the same - probably not even close.
But to answer your question, the '00-'03 GSXR750 uses a 4-bolt flange.