The Lightning AirPods 2 don't support lossless audio on the Vision Pro, but the USB-C version does. I've seen mention of the H2 chip being upgraded in the USB-C version, but the site below attributes the difference to the Lightning AP2 using the U1 chips while the USB-C AP2 uses the U2 chip.To my knowledge the only difference between the Lightning and USB-C version is the charging case. There is no difference in the AirPods. It is possible to order just the USB-C case. That seems like a waste as my Lightning case works just fine with either a cable or MagSafe charging. For $100.00 I would not even consider updating the case to USB-C.
Maybe that won't make a difference for the hearing features, but I wouldn't be surprised if Apple decides it does.

Latest AirPods Pro 2 (USB-C) vs AirPods Pro 2 (lightning): What's the real difference?
Apple's new AirPods boast a USB-C rather than lightning charging port, but that's not the only difference worth noting.
