Any one know, are the bodys the same (2WD-vs-4WD) with just solid mounts insted of shocks?

In other words, can I use my 2WD body as a patern for a 4WD front bumper, and just make mounts that bolt up to the shock mounting points.

what year, as the crome -83 bumpers are different thanthe 83-84(and up brat) bumpers

 

although i think one mounting ststem(crome) can be retrofitted to the latter (had the idea to do, but lost half my parts before it was done)