Are A body and B body radios interchangeable?

Question for you all...will any B-body radio fit in an A-body? I have a 65 Barracuda and I am looking to repalce the cassette radio that came in mine with an original unit..I have XM isntalled and so could care less if the radio actually works or not. I found a B-body radio from a 65 coronet that looks right but want to be sure before I spend the money on something I have no use for. Any suggestions or help please respond or PM me please.