Volkswagen also bought Audi, Skoda, Bentley, Seat, Lamborghini, Bugatti, Scannia, Man, Ducatti and Porsche and they keep being all different brands on the market. One company buying other don't means they merge, only that they share bosses and funds. Also ideas spread faster between the brands and they can do cross measures and take ideas from one another without being sued.
Snail Games and Wildcard is the same.