From what I've seen the inner pulley on an AE86 one sits out an extra 1/2mm so it puts the alternator and pump pulley out ever so slightly (assuming you're running FWD ones). TBH though I doubt it would give you any dramas though. The other thing you need to check is if the overall diameter of the crank pulley is any smaller on the AE86 one otherwise you'll lose boost from the SC, but it shouldn't' matter to you since you aren't running an SC lol.
I'm going to have to do the same for P/S and aircon, except I'm already running all the other RWD gear, alt bracket, pump etc.