I had AirPod Max from 2020 forward and I have several pairs for Family. What I’ve found is that any replacement ear cushions that are sold on the market degrade sound quality considerably, active noise cancellation is also degraded, so you must be careful what type of modifications are done. In addition, Apple’s ear cushions bleed, sound, so there are Silicon covers that you can get that make a better seal around your ear, and the sound to me is identical to the AirPods Pro Gen 2 USB-C.
By the way, I can hear in both the AirPods Pro and the AirPods Max, the two stage of noise cancellation, the first stage, and then the sampling and the second stage of noise cancellation. The H1 chip processes this slower than the H2 chip however.
iFixIt group said the upgrade to USB-C for AirPods Max have a slight change to the amount of adhesive used around the components within the earcup, some of this may be due to prevention of any type of condensation, which may or may have never caused an issue in the past. They also noted that there was a different type of adhesive used to seal the speaker.
So weird because as a kid, I would rent these video games day 1 from the local library… free of charge.
What is the issue now that they are retro. Shame.
Thankful to have all mine… back… up… and running.