It'd guess they interchange (they do in earlier years). However they are not the same. The big trucks have much thicker cores than the little trucks.

I'd keep the original mechanical fan, they are reliable and work well.

•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-