AA and BB interchangeable parts

[Denali]

I just purchased a good 'Field Find' 1934 Ford BB truck and I was wondering what specific parts I have on hand, or can order, from the Model AA portions of catalogs, that I can use. I find that parts for the 4 banger engine are not available for instance. Are the rear hub seals the same on a BB as the AA? Etc. Thank you.
Mark in Fairbanks Alaska