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Except for the wind deflectora and grill (the 53 radiator mount horseshoe does not have the cross rod bracing but is otherwise the same/interchangable) all the front sheet metal is the same 53-56. The hood hinges are different, but the 56 hinges will bolt up to the 53 hood with the 56 shoulder bolts.
As AXracer said everything is the same except the hinges and head light buckets.
In this picture with the old cab I was going to use a one piece air deflector and a 55 grill. With the 55 grill there is no need for head light buckets.
Here is the front sheet metal with a 56 air deflector with buckets.
That's some fancy air deflector! Don't leave out the rubber ones between the underhood and top of the deflector and the one that seals between the gravel pan and deflector bottom.