Yes, they are interchangeable. There may be slight differences in the weights and advance curves, but they will swap between motors.
It depends on the years but I`m purdy sure that 70 up all interchange. You may want to ask on fordsix.com to be sure .
They all interchange back into the 60's. My distributor is out of a 1983 200 and I'm running it in a 1974 250. I read of people doing Duraspark conversions on 60's Mustangs all the time and using Distributors off late 70's cars in 60's 170's and 200's.