Significant — you’d need to either get the old Linux build working (not an easy task today) or you can install it on Windows, copy the files over, and run it via Proton (but you’d need to manually add the registry key with your CD key to the Proton prefix’s registry).
I checked CapFriendly, all four of the players in the NHL have contracts that expire at the end of the season.
Hart: https://www.capfriendly.com/players/carter-hart
Dube: https://www.capfriendly.com/players/dillon-dube
Foote: https://www.capfriendly.com/players/cal-foote
McLeod: https://www.capfriendly.com/players/michael-mcleod