No, there are two versions of PUBG. Fully developed PUBG, which is on PC and Xbox One, and PUBG Mobile, available on Android and iOS, but can be played via PC through an Android Emulator (BlueStacks, Tencent Gaming Buddy)
Uses a dedicated server for each of the common PUBG-related systems. Therefore Xbox and PC use different servers. The mobile version uses the same server in iOS and Android, but it does the same difference as the Fortnite where the emulator PC-based players are paired with other similar PC players. As long as they do not join the party with an emulator-player, the mobile players are not matched against them.