It looks as though, save for modifications to give clearance to the screw holes, the actual hole punched through the sub-cowl is the same size. That said, some years seem to have a bit of plastic extending through the hole from inside. Making an alternate air plenum part might be a bit easier than originally thought.
Bambu Lab P1S, overall I'm very pleased with it. Handles ABS and ASA prints with relative ease. Most of the parts take between 0.5 to 3 hours (not including cooling time), except for the main air plenum...that one comes in at ~14 hours with higher print quality settings. The plenum is also a bit wasteful as it uses a lot of material for support. I tried flipping the part over on the print bed to reduce support but quality of the finished part suffered remarkably.
Thanks!