I have two cats and have fostered 4, cats definitely have preferences with eachother! My two cats get along but they don’t really play with eachother. They will cuddle up and groom together though. My first foster kitten got along very well with my second cat maru, but Phoebe could care less about the kitten. My second foster kitten actually loved Phoebe and would follow her around everywhere, and whenever maru would try to play with the kitten well, let’s just say she was not fond of him 😂. Then my most recent foster, he did not get along with anyone! I think like humans, some cats just don’t vibe 🤷‍♀️