Leaders like to associate with other like-minded leaders. That’s perfectly natural. So, when adding to the team, in my experience, people typically tend to hire someone they can easily get along with, relate to and with whom they will enjoy working.
The challenge is that often translates into hiring people who think like them, make decisions like them, and even have similar life interests.
While hiring for cultural fit and chemistry on the team is certainly something I agree with and try to practice, I encourage senior leaders not to hire another “of them” for the team.