Early vs Late 3v Crank Pulley Differences?

Yes, for A/C cars and some trucks, maybe others.
I meant from 69 to 70 - all else being equal. In other words, since it sounds like the crank pulleys changed from 69-70, and not just the w/p pulleys. If that's true, wouldn't either the alternator pulley or bracket have to change in '70 to compensate?