Are snow leopards related to cats?

No. Every leopard has a different pattern. Spotted leopards dont like black leopards. so they cant "date" the real term is mate. but snow leopards need to be where its cold hint the Word snow. and spotted leopards live in South Africa. if u put a snow leopard where its really hot like South Africa the chances are that the Snow leopard will not survive because its prob not going to know the habit and where to find food, water, etc. and if u put a spotted leopard where the snow leopards live it wont be able to find that stuff either.

so the answer to "can spotted leopards and snow leopards date?" is no they cant.

Nearly all Felidae (cats) can interbreed, Leopards and snow leopards are both Panthera genus, and thus related fairly closely.

But since there are several different types of leopards, the chances of any particular ones mating would depend upon a number of factors.