Mini SpongeBob looks similar to the real SpongeBob, except it is squarer, does not have any holes, and is a lot smaller than the real SpongeBob. He also does not have a belt on his pants. Mini SpongeBob's nose is not the same as SpongeBob's, because Mini SpongeBob's nose is a small little stub, and SpongeBob's is an oval shape and longer.
"Best Day Ever"
He is bigger and more realistic. He has holes, dresses exactly the same way, and looks more like SpongeBob. It could be possible that SpongeBob redesigned it.