I don't think there is a way to do this. I'd try repairing? (Settings --> Bluetooth --- forget. Hold button on back of AirPods with top open near iPhone to re-pair).
My APP2 sound identical before/after the update. I test with a fan next to my desk.
Hi, yes a re-paired again but nothing changes.
I tested with apple watch, the ANC has lost 8db of power in reduce sound and it's noticeable.
I'll have ac+, i'll try a swap, many people state the ANC hasn't been wrecked.. so perhaps it just my unit (even if i'm really doubtful about it).