I think they are the same. My 1 ton had the trans with brake from a bigger truck, and appeared to be the right and original driveshaft without modifications.

You should still get a real answer before deciding, but so far I think they are the same.

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-