First of all, you don't have a t5, you have an AX-4 transmission(4spd) the AX-5 is the 5spd. We covered that in a previous thread. Let me see if I can get theis straight...
You have a 4 spd 2WD trans now...you want to get a 5 spd with an xfercase on it to eventually do a 4WD sawp.
Your question is: Can I remove the Xfer case and tail cone from the 5 spd and use the tail cone from the 4 spd on the 5 spd?
My advice: How long until you expect to do a 4WD swap? If it's only a few months...drive the 4 spd and leave the 5spd intact..less chance to break something, etc...
Plus, I am not too sure of how the output shafts on the 2WD vs 4WD trans are, one maybe shorter or longer than the other which would require you to crack the cases on both of them and swap, which is just wasted work since you would have to swap back to do a 4WD conversion.
If you ask questions that are easier to understand, you will get more answers to help your cause........just a tip