Multiverse-2 is a completely separate Multiverse. It will host many worlds that will not coexist with the main Multiverse.
Earth-0: Main Ben 10 continuity (aka Prime Earth)
Earth-1: Ben 10 (Rebooted)
Earth-2: Max 10
Earth-3: Evil Universe
Earth-4: Generator Rex's Universe
Earth-5: Feedback
Earth-7: Ben 10: Alien Hero
Earth-10: Mad Ben's World
Earth-11: Gwen 10
Earth-12: Ben 12
Earth-14: Forever Ben
Earth-20: Ben 10: Time Invasion
Earth-23: Ben 23
Earth-30: The Omni-Force
Earth-33: Ben 10: Advanced Hero
Earth-35: Benzarro's World
Earth-40: Ben 10: Time Crisis