I think a picture might help clarify this a little. The mag on the left came with my P10C manufactured: 11/2017
The mag on the right came with my P07 manufactured: 3/2018 (don't mind the +2 extension)
The ambi mag catch engages the single square notch on the front of the mag.
The reversible release engages one of the the notches in bottom set of cut-outs, depending on which side its setup for.
I can only speak to my experience but I'm able to swap these mags between both of these guns without giving it a second thought. I've never had a problem either way.