Whether it is a division level or not depends on what institution it is. If it is a college at the main hall level, that is, a double-non-undergraduate college, the principal and party secretary of the school are all at the main hall level, then the dean and dean are all at the level.
So nominally, they are the same level. However, the scope of responsibility is different. The dean is responsible for the administrative work of the college, managing the affairs of the college and conveying the instructions from the superior. The school director's words are a certain aspect of managing the school. For example, the equipment supervisor is to manage the equipment procurement of large and small laboratories or various classrooms in schools.