Can I use my 2014 Xbox One MCC to play 2019 PC MCC?
The short answer is no, you would have to buy this game in Steam or Windows 10 store to play with your friends.
You can buy some games on the Xbox / Windows Store and play it on the other console, those games are apart of something that Microsoft calls "play anywhere". This game is not apart of this program making it so you will have to buy it on PC if you want to play with your friends.