One thing to note is that Apple is using a different pricing strategy in headphones then with their traditional products. They are pricing them higher, but are offering very deep discounts on sale. For example, AirPods and AirPods Pro sold with 30% discount everywhere past Black Friday. This would translate to a sub $400 price point on sale for the max, which put them in line with the competition from Bose and Sony.
It basically boils down to a few relatively minor camera features perhaps except for the addition of a 2x camera (The other differences are Lidar sensor, 60fps HDR recording at vs 30fps, and saving in RAW).
It looks like they think that just creating the impression that the pro model is better is enough to get more money from people who are less price sensitive.