PartyPoker, Borgata Poker, and BetMGM are all partners of each other that transact in NJ under the interactive gaming license possessed by the Borgata Casino in Atlantic City. They therefore have the same software and 99%+ of the same poker games and traffic. Where they mostly differ is in promotions, like the initial poker bonus, and the presence or absence of attached products like a sportsbook and casino. Customers are allowed to have accounts at all three sites and benefit from the welcome bonuses and other promos offered at each of them.