Blue cat has a little longer nose and whiskers are made from the fishing line. Fur is short and it feels extremely soft. Paws are sewed on. Black cat has bigger eyes, really bushy tail and whiskers are made from strings. It’s fur is longer and thicker. Both of them has plastic pellets inside their paws for giving them floppyness and realistic weight.
I have already sold the black cat, but blue one is still on sale for 50 € + shipping.