one is newer. they are the chassis number. the ae92 is FWD.
the ae86 is likely what you want. The corolla GT-s in the states. If you want a project, an sr-5 would work also. It requires some work to make it like the gts though. I believe it has drum brakes, or maybe only in rear, different motor, and other ****.
I think the 20valve 4ag that is swapped into takumis and other real life ae86s comes from the ae92.
visit club4ag.com if you havent already. I think you wil find all you want to know and more at this site. it is really great.