1985 flareside

the floor on my truck is really bad, has a lot of rust and I think that the last owner tried to fix it with some glue and paper card.... a certified technician charges me like 400 dlls for the floor and other little thing that need to be fixed...
By the other hand, I found a 1996 cab in perfect shape, has no dents, no rust, front and back windows and the guy wants 100 dlls for it.
Now my question is..... does the 1996 cab fits on my 1985 truck ( fender lines, door lines, the interior) hope someone could give me a hint