Yes. The Untapped.gg MARVEL SNAP tracker is capable of tracking all your MARVEL SNAP game accounts across the Multiverse. Well, there's a limit, but you can have more than one.

You don't need to do anything special, the Companion app will track each account's collection and matches separately. You can switch which profile is displayed in the Untapped.gg website by clicking the three dots in the top right corner and selecting the user you want to see in the drop-down menu.