Well, they are both blue cats. So I can understand why you'd think that.
So is Doraemon, and he doesn't look like Gumball. Good night, everybody.
That is true. They don't look alike other than being cats and blue (and maybe the round eyes), but I could see why it would remind him of Gumball. Goodnight to you, too (even though it's only 17:09 where I live...).