I think the diffs are different (the part numbers are) and the drive gears are different... worm bevel gears now...

On the subject of diffs the gearcase design is sweet and you can change the diffs merely by removing the front (or rear for rear diff) of the diff case, makes for a simple change of diff oil should you need it... Maximum 6 bolts for each diff (front/rear) center is a little more complicated...