They are all the same. The only differences throughout the years are the vc, and thats only the recess where the three bolts connect. As far as i am aware Rallye vc’s are the latter 25mm ones. Maybe ask a seller to measure for you? As per the pic below, you can see the one on the right has a 25mm recess.
the rear diffs are the same, no difference at all. The gearbox is different, and stronger
Do you live in the uk? i have a few rear diffs here if you do. No 25mm vc’s though (im keeping them), but have a couple 22mm versions spare