The difference between APP 1 and 2 are already small. Biggest would have been better noise canceling, but even that isn’t a huge improvement according to reviews.
I think the bigger difference, which I’m pointing out, (no need to get defensive), is the fact that dirty used AirPods Pro preform much worse than new ones. The difference here would be comparable to jumping from APP 1 to APP 2, sound wise, maybe even more.
But I welcome all to enjoy their $249 for 10% improvement, which will degrade overtime anyways as they get dirty. I got my improvement for free.