You're talking about all good quality products carnauba products - so no harm will be done. My guess is that the differences will be subtle, and will have the most to do wuth whatever is on top.
My advice is to do different sections of the car differently. A front fender one way, the front door another, the rear door still another, and the rear fender a 4th way. This causes absolutely no harm, and, if there IS a difference big enough to notice, you can choose what you like and do the rest that way. If there is NOT a difference, you will also have learned something - and I hope you share it with us. If you do go this route, be sure to ask others as follows:
1) Do you see any difference in apperance between the different panels on this side of the car? (Note they might think you're talking about a re-paint job - but that is OK.) The goal is to AVOID telling them anything that might prejudice them before they answer, like "there's 4 different waxes on there" or "the door has P21 on it".
2) If they answer NO, end of questions. If they answer YES, then ask "which do you like the best?" - and ask them to see if they can articulate how they perceive the differences.
3) If they're interested, now you can tell them what you're doing and what's where.
4) TELL US WHAT YOU LEARNED! :bounce
Can you tell I used to do market research as part of my job?