A bushel of beans is 60 lb of beans. A bushel of corn is 56 lb of corn.
Most beans are sold in 140,000 seeds/bags. Corn is sold in 80,000 seeds/bag. Weights and size of each are all over the place. I had a bag of RR2 beans that we used on our plot and it was close to 60#. Most I use on the farm in the past are closer to 40#. Seed is sorted and bagged by size. The exact same variety can have big seeds and little seeds. Some farmers want large seed, some what small, some want medium rounds, some want medium flats. It has to be bagged according to size so the farmers using vaccum planters can set the correct pressure.
And for the guys that dont like bags they can get their stuff in pro boxes or bulk and let an auger lift everything into the planter.
32# would be a bushel of oats.
And when you think of a bushel dont think of a bushel basket, think of weight. That is all that matters. A semi filled with 60# test weight corn will have way more bushels than a semi filled with 50# test weight corn.