Hi, I just got a 4 month old kitty cat named Cozmo today. He has been eating iams dry kitten food, and the place I got him from gave me some of the food he has been eating. I fed Missy her soft food tonight and the next thing I know Cozmo was eating Missy's wet food. He didn't eat allot of it but he had a good meal before I took it away from him. Will this be a problem if he eats something different than he is used to? I would feel just awful if he got sick his first night here.