Notwithstanding any other provision of this part, the board of directors of a metropolitan water district, or the governing body of any other public agency, shall adopt any order, motion, resolution or ordinance, required under the provisions of this part to be adopted by a majority vote or by a two-thirds vote or by any other specified vote, by an affirmative vote as constitutes under the provisions of the Metropolitan Water District Act (Chapter 209 of the Statutes of 1969), or the statute creating or authorizing the organization of any other public agency, a majority vote or a two-thirds vote or other specified vote, as the case may be, of the board or body.