Splash apron should be the same.
Bumper is about 1/4" thick on a 1 ton, and much thinner on a 1/2 ton, if you were curious.

Looking in the parts manual will answer and confirm a number of your questions.
Start here:
http://chevy.oldcarmanualproject.com/
End up here:
http://chevy.oldcarmanualproject.com/1929_54chevyparts/index.htm

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-