Need help with my brakes!

I just purchased an 8 3/4 out of a 70 duster. I have a question about the brakes; will i be able to swap the brake drums off of my 7 1/4 my new 8 3/4? The 7 1/4 is bbp while the 8 is sbp, and i just got new yukon axles that are bbp. The drums off my old 7 1/4 only have about 200 miles on them. Any info is appreciated!