There is no difference whatsoever between physical dumps or psn downloads. They all share the same serial. The games don’t have any headers afaik similar to the 3ds and stuff. So save yourself the trouble and just download them. If for whatever reason you still want to dump them, I can guide you through that as well later once you get to that step.
Ok, I got one game that has a different serial. I know because after it installed via PKGj I got a second bubble of the same game.
So, if you don't mind, what is the process for dumping a game?