Do all iPad pros have faceid

Did you see the official list ? Not totally uptodate as it dates sept 2021 (missing iPad Pro 5th gen)

https://support.apple.com/en-gb/HT209183

You can use Face ID on these devices:

iPhone
iPhone 13 Pro Max
iPhone 13 Pro
iPhone 13 mini
iPhone 13
iPhone 12 Pro Max
iPhone 12 Pro
iPhone 12 mini
iPhone 12
iPhone 11 Pro Max
iPhone 11 Pro
iPhone 11
iPhone XS Max
iPhone XS
iPhone XR
iPhone X
 
iPad
iPad Pro 12.9-inch (4th generation)
iPad Pro 12.9-inch (3rd generation)
iPad Pro 11-inch (2nd generation)
iPad Pro 11-inch

Only missing is iPad Pro 1st gen

https://apple.fandom.com/wiki/List_of_iPad_models#iPad_Pro

No, the first two generations of iPad Pro’s didn’t.

https://everymac.com/systems/apple/ipad/specs/apple-ipad-pro-9-7-inch-1st-gen-wi-fi-only-specs.html https://everymac.com/systems/apple/ipad/specs/apple-ipad-pro-10-5-inch-wi-fi-only-specs.html

The 11’ iPad Pro was the first to support FaceID: https://everymac.com/systems/apple/ipad/specs/apple-ipad-pro-11-inch-a1980-wi-fi-only-specs.html