Yup. A lot of the B bodies did, they can be used on A’s unless the caliper has the inlet on the very bottom. In which case you can still use the caliper brackets, just not that particular pin caliper.
The pads and pins should be the same for all of the different pin type calipers. The 73/74 B body pin calipers have the brake hose inlet of the bottom of the caliper, that particular layout does not clear on an A-body. If you buy rebuild calipers check to make sure they’re both the same and don’t have the bottom inlet, they’re not really separated according to the inlet layout the way they should be.