(a) Bonds of a district operating under the provisions of Article III, § 52, of the Texas Constitution, may be issued only with the approval of two-thirds of the electors of the district participating in the election.
(b) In a district organized under the provisions of Article XVI, § 59, of the Texas Constitution, bonds may be issued or indebtedness created only with the approval of a majority of the electors of the district participating in the election.