Yes. A broker can share a fee with a principal, regardless of the principal's profession or license status. However, the broker is not required to do so. A concession of part of the broker’s fee to a principal is a business decision made by the broker.
Remember, a broker is prohibited from sharing a commission with an attorney who represents a party in a transaction. In that situation, the attorney would need to seek payment from his client.
Keep in mind that if you decide to share your fee with a principal who you don’t represent, you must obtain consent from your client to do so.