According to Apple, the AirPods Pro (2nd generation) supports charging methods including: Apple Watch charger, MagSafe charger, lightning interface, and QI-certified charger. That includes the Apple Watch's magnetic charger.
In addition, from the point of view of the compatibility of the Apple Watch charger, whether it is the early USB-A interface charger, or the USB-C interface charger used now, it can be compatible with AirPods Pro (second generation).