How can two Managers see the other's direct reports in My Teams?

Summary: Two Managers want to see the other's direct reports in My Teams, but they can only see their own. Can this be done without changing the Approval Rule?

Content (please ensure you mask any confidential information): They are in the same department.

Version (include the version you are using, if applicable): 24c

Code Snippet (add any code snippets that support your topic, if applicable):