i just connect to toolbox to find that out for each car i work on.
The rule is, if you have MCU1, and have only front cam, that means MCU1 with AP1.
If you have MCU1, and have side cameras, you have MCU1 and AP2.
If you have MCU2, you have MCU2 and AP2.5, unless your car was manufactured in second quarter of 2019, where you have a 50/50 chance of having MCU2 with AP3.
Some people use the spec sheet page of the tesla website under your account to get that info. its imbedded in hidden html so you have to click on view source for the page and find it way down where your car config shows up as a list. there is somewhere this is explained but i forgot exactly where.