The answer is “No”. PUBG Desktop can play against or for only with users who play on PUBG Deskop. PUBG Desktop users can’t play against PUBG Mobile or play with their friends who play PUBG on Mobile and the vice versa is also true
So if you have PUBG Desktop and you are planning to join your friends who have PUBG mobile, you can’t do that.
PUBG doesn’t not support cross platform versions of the same.I believe Android users can play only against those who have Android or iPhone.
And those who have consoles can’t play against those who have PC!