7.25 to 8.25 Swap Questions

So I have a question, and I apologise if this should be thrown under an engine swap thread, but I'm installing this 8.25 to:
a) accommodate wheels without adapters and upgrade to BBP.
b) handle a bit more power than my 7.25.
I'm wrapping up the engine build on the 360 that will be replacing the S6 currently installed. My question is, I will be swapping out the S6/904 combo for a 360/904 set up, my understanding is that all 904s have the same tail end length, if I swap in this rear end prior to completing the engine swap, would my driveshaft length be incorrect when the 360 is in if I measured according to the positioning/length of the current S6/904?