Treat all interviews equally.
For executive level interviews, you might find yourself meeting with colleagues who would be on your level and even direct reports in addition to upper management. Make sure you keep focused during those interviews and treat them professionally, just like you would with a supervisor. It can be a natural reaction to be more casual around your peers or more authoritative around your subordinates, but it’s likely that all of these individuals will be asked to weigh in on your fit for the role, so make sure to stay professional, stay courteous, and be consistent with your information and approach.