Key received from Lootboy pack, and I own the game already.
I was able to identify the game key's subID, and SteamDB says "No cross region trading and gifting," but from my understanding that only affects trading/gifting on Steam. I don't think the key is region locked, but please allow to delete if it is. https://steamdb.info/sub/190971/info/
Good luck! - Please remember to mark received if you win.