The apple doesn’t fall far from the tree
Animals learn a lot from their environment, and they often imitate other animals or humans around them. It seems as if this cat imitates his fluffy doll; he looks like him, so why shouldn’t he act as he does? Besides, it’s another excuse to take a nap, and no cat in his right mind would ever refuse a nap.
Cats and other pets like stuffed animals for different reasons. It might help them cope with anxiety and behavioral issues, it makes them feel as if they have company, they like carrying them around in their mouths, playing with them, chewing them or cuddling with them. In this case, it seems as if this cat has found his soul mate.