Well, maybe. Usually, it's a no, because a skill replacement stunt doesn't allow you to simply switch out a skill, it allows you to use a skill instead of another skill in a specific circumstance. Another stunt will give you a bonus on a roll but in a different circumstance, so the two stunts will be mutually exclusive.
Then again, if both stunts could justifiably be active, sure. A teacher threatening a student with a weapon seems highly unlikely. A warden threatening a magical practitioner with the symbol of his station, the silver sword? Absolutely.