Cams from the early B16A (or A1 as it is called here in Europe) and cams from the B16A2 are different, at least in appearance.
Link: https://honda-tech.com/zerothread?id=1220642

However, does anybody know if there is a difference in performance? The reason I am asking is that I have a 91' CRX VT (came with B16A1 from Honda) with the early version of the cams (obviously) and I have a set of A2 ones lying around and I wonder if the work is worthwhile to change them.

I know that the displacement , compression and bore/stroke are the same for both motors. The A1 is rated at 150hp and the A2 at 160 - are the cams the determining factor for that difference?

 

I believe the hp difference is in the fuel/ignition maps in the ecu.If the cams are not in the engine than I would use the A2,but if you need to remove them than I wouldn't .