No compatibilities exist. Even the 92 and 93 are enough different that the proms are not the same.
As far as GM tuners is concerned, you have to know what you want ahead of time to make sure it'* right. Dyno work would be the best way to determine what you need. And as far as changes are concerned, you're better off not going far enough than going too far. Make sure all your mods are done before doing one.
If you dyno, make sure you also chart AFR. You'll need that data for the burn. Also keep in mind that aftermarket chips will remove the factory torque-limiting tables that protect the trans. That in part cost me mine.