(a) BLM may, with the consent of the lessees involved, establish, alter, change, or revoke rates of operations (including drilling, operations, production, and other requirements) of the leases, and make conditions with respect to the leases, in connection with the creation and operation of any such unit agreement as BLM may consider necessary or advisable to secure the protection of the public interest.

(b) If leases to be included in a unit have unlike lease terms, such leases need not be modified to be in the same unit.