yes, JZA70 = 1JZ
MA71 = 7M-GTE
there is more to swapping than what Alvin said too, subframes are different + 11ty other things!
also, be cool like me and get the "R" model
As for most sought after, that would be the MA71 Turbo "A", 500 made, all black with brown leather etc, bigger turbo, bigger throttle body, tougher bottom end, they were the Group A homoligation model.
as for how much, if you have to ask you can't afford