this Rig Rundown speaks volumes
https://www.youtube.com/watch?v=j5C7GKGxICggranted, his tech says that Angus is using some custom shop Duncan pickups. although he does get the specs wrong. once this video hit, Duncan's phone lines melted and they took the old "hidden menu" Angus Young set] and started to openly sell it as the High Voltage set. but.. that is not what he was using 40 years ago. in fact, the AY/HV set was also a part of a collaboration to get both of his main SGs to sound identical... which also took into account tweaks to the bridge hardware and updates to his wiring harness.
on paper, the specs between the Duncan AY/HV set and the BKP RR set are close enough to split hairs.
with all that in mind, watch the rest of that Rig Rundown to get a load of what's going on with his amps, his rack, and even his wireless, that have at least as much to do with it as his pickups.
as for the PCB... I'd personally dump it, but it's dealer's choice.