Center diff/4 spider gear ???S

[turbotalon1g]

Well i trust you guys, cause you always give good advice.
I need some info on the following. i have a '92 tranny with stock T-case and welded center, i want to buy a 4 spider and someone is selling one out of a '90 how can i check that it will fit?

Thanks
Aaron
(oh yeah, hopefully the panda look will be gone next year)