rear diff question

[alc5m]

So i have a 96 hoe, my brothers old truck was a 94 burban

we believe i have a bad axle in the rear, so i was wondering what the differences between the 94 diff and the 96 diff could possibly be, and what to look for to tell if the axles will work

thanks

 

[trx88]

number of lugs, size of drums, gt code in the glove box on the sticker tells you what gear ratios, spring perch distances and u joints