Wanting to dual boot Windows with Kubuntu. Am I fine getting a Windows 10 key instead of 11?

A couple of months ago, I wiped Windows off my old laptop and installed Kubuntu instead. Now, I was thinking of dual booting Windows additionally for a certain game (definitely not League of Legends, for sure not) and will need to buy a new key. Am I fine getting a copy of Windows 10 despite Microsoft's discontinuation, or...