The front sheet metal will interchange, the rear fenders are the same. The major difference is the 54/55 front fenders have a dimple or recessed area for the grille/parking light assembly. You can install the 1947/53 front sheet metal as a complete unit to a 54/55 cab, or you can install the complete sheet metal unit from a 1954/5 to a 1947/53 cab. This is true with exchanging Chevrolet sheet metal with GMC and visa versa.
I have seen a 1947/53 fender used on a 1954/55 suburban, it worked but the fender needed to be bumped in for the grille/parking light. The grille opening is square on the 1947/53 and rounded on the 1954/55.
I am not sure if the beds will interchange easily, I do know they have differences. Hope this helps.
