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Page BR-19 of your freebie factory service manual covers the major differences between the various brakes on the Z31. (FSM at XenonZ31 Reference
with other cool docs. Info feast!) The whole brakes chapter is a short read.
I'm not convinced that I ever noticed a difference between my NA brakes and my turbo, but I wasn't really looking. Maybe someone here can explain. Great brakes when done right, no question. Nissan designed them right for the Z31s. If you can get them back to Day One performance, knocks your socks off.
You don't say what year Z31 you're working on so our brakes experts might just pass up your post. Anyway, just check out the manual and see what questions remain in your planned swap. The parts fiches can give you original Nissan part numbers and you can take those to your parts places for aftermarket 'equivalents.' Smart to take the old part with you. Nissan may have a few OEM part$$ and piece$$ left, gotta check that out with a local dealer - one part at a time.
Thanks and welcome again!