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There are three versions. The S series which is the smallest. The Pro series which is intermediate in size, and the the X series. So every X is also a Pro. You will see the difference if you go to Garmins website and go to the link for the Fenix 6 series. When you select the different sizes the model names change. https://buy.garmin.com/en-US/US/p/641435/pn/010-02157-10. It can be a little confusing but you just need to decide what size you want and then the features.
The differences are the lens and bezel materials. Lens Material - Corning® Gorilla® Glass DX or Sapphire Crystal Bezel Material - stainless steel or Diamond-like Carbon (DLC) coated steel For more information contact us at product.support@garmin.com or visit our Support Center, https://support.garmin.com/en-US/ Thanks Jenny
According to all the reviews I've seen only the glass is different between them.
Nothing. Just the name and appearance