I own a 94 Mustang GT 5 speed and I drove a 2004 Mustang GT 5 speed and I noticed no difference... yet again I did not take it off and do the same to mine and compare the differences...so I don't know for sure
from what I remember 94-95 was specific...something with the brakes sensor or the brake was different. It's been a few years since I did the 5 speed swap on my 95 but I could be wrong.