Frame, 6 lug wheels vs. 8 lug, brakes, rear axle and ratios, front axle, springs, maybe wheelbase and bed length (150 didn't have a short bed), tire/wheel sizes and a heavier duty Hydra-Matic transmission if you have an automatic are different.
Cab, radiator and mounting hardware, front sheet metal and bed sheet metal is the same assuming the same wheelbase. Electrics, engines and manual transmissions are the same.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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