I would say they are probably just oridinary domestic short hair kitties. The little black and white one is what most call a "tuxedo" kitty. They are both very cute. Welcome to TCS! I just sent you a private message which has a few helpful hints about questions many new members have. If you need any help, please send a message back
I'd go with domestic shorthair, which is to say, "mixed" -- actually the best "breed" of all, the healthiest and the ones most in need of loving homes!
Your light-colored cat is white? or yellow? And your black-and-white kitten is a tuxedo (what black and white cats are called, because they look like they're wearing tuxes!)