छत्ते बट्टे का मतलब?

I found this expression: "एक ही थाली के छत्ते बट्टे". I understand that it means "two peas in a pod" or "cast in the same mold", but what does छत्ते बट्टे actually mean? I think maybe it means honeycomb? But it isn't in my dictionary and the internet is being unhelpful beyond providing high-level meaning of the phrase. Thank you!