I've rebuilt the rear axle to include the rear hubs for my early ’32. I was able to use ’31 bearings, hubs, axle rod, cup/race, etc. to rebuild the rear axle inclusive of the rear hub. However, the rear stud lugs are not shared between 1931 and 1932. Also, the rear and the front stud lugs for a 1932 are not interchangeable.
As far as swapping the actual hub (items in the bottom of the picture) I am not sure if you can take a Model A hub and swap it with a 1932.