most of the S10 early/late changes were additional bracing or bumper mounts or brake line mounts, or fuel line provisions or slight changes to the crossmembers. like an 86 longbed will have a carrier bearing crossmember, a tube trans crossmember, fuel lines inside the frame rail, and rail boxing to just aft of the trans crossmember, but a 98 longbed will have no carrier crossmember, fuel lines external to the frame rail, a box trans crossmember, and boxing will extend to the front leaf mounts
I had a bagged mazda ext cab years ago and it ran through all my friends before someone pulled the body off and put a plymouth body on it, you just reminded me.