disc brake question

I was wondering if all a-body disc brakes are the same, with the exception of the small bolt pattern and big bolt pattern. The reason I am asking is because i just purchased a complete set of a-body disc brake parts at Mopar Nats and forgot to ask what year they came off of. It was so hot and the price was awesome, and I got excited and forgot to ask. I know it is the small bolt pattern, but was curious if there were different ones. I have a 70 duster that I am putting these on. Will the late 60's barracuda ones still work?