I got a 72 Cb 500 parts bike for my 74 cb 550. The frames and wheels are the closest cross match. They changed a bunch of things for the f model in 1975. Even the k model was disappointing in a chassis parts cross. For one the kick stand moved positions. I know the rear wheel wouldn't direct swap from the f model to the 74.
If you are shopping for a parts bike, probably look for pre 77, then k models and then 74 k . Of course the earlier cb 500 you can find the better for chassis parts.
But if you are looking to swap in a 550 engine the 74 is probably the best for the most parts crossover.
Cheers,