all the MA gearboxes are interchangeable.
As long as you have the drive shafts that match your hubs you will be fine.
I ran a couple of 1.1 boxes from MK1's and MK2's on my MK2 VTS without issue.
Read some shit on here years ago where people said they were fitting different gearboxes and the drive shafts were not long enough, dont see how its possible tbh.
There are a couple types of drive shafts, some with tapered ends and some with flat ends.