The principle is similar, but they are not one and the same. While a Business Referral Agreement states that one party agrees to refer potential clients to the other in exchange for the referral fee, the Mutual Referral Agreement is used when the obligation is mutual.
A Mutual Referral Agreement can be exclusive, but it doesn’t have to be. Everything depends on whether you include an exclusivity clause in the agreement. This clause could prevent the other party from referring clients to anybody else other than you, which would include your competitors.