This part shall be administered by the board in conformity with its powers and duties set forth in Part 3 (commencing with Section 20000). The board shall, to the extent it determines feasible, follow the procedures set forth in Article 7 (commencing with Section 20220) of Chapter 2 of Part 3. The power conferred upon the board by Sections 20134 and 20160 shall encompass any retirement system under this part, including participating agencies that contract for board administration of replacement benefits and employers that are required to enroll members in replacement benefits pursuant to Section 21757.