Except as otherwise provided in Section 45045, the governing board of a school district in which a continuous school program is in operation pursuant to Chapter 5 (commencing with Section 37600) of Part 22 of this division, but in fewer than all of the schools in the district or with fewer than all of the certificated employees participating therein, and in which revised salary schedules become effective on a date other than July 1, may adjust the salaries of certificated employees participating in the continuous school program so that the total amount payable to each such employee in a school year does not differ from the salary which would be payable to him over such a period if he were not participating in the program.