Doesn't „Pro“ just mean expensive at Apple?
Since Apples „Pro“ watch is build to compete with professional sport smartwatches like the Garmin Fenix, it should feature ANT+ (used by a majority of devices/sensors) and it should also mean that you can connect the HR monitor of this „Pro“ watch to a simple cycling computer like a Wahoo Elemnt - without Apples GymKit.
Since Apples „Pro“ watch is build to compete with professional sport smartwatches like the Garmin Fenix, it should feature ANT+ (used by a majority of devices/sensors) and it should also mean that you can connect the HR monitor of this „Pro“ watch to a simple cycling computer like a Wahoo Elemnt - without Apples GymKit.