If the board makes any change in the local roll pursuant to Sections 1840 and 1841, the local roll as so changed, together with the board roll as transmitted to the auditor pursuant to Section 756 and the estimate with any changes transmitted pursuant to Section 755, shall become the last equalized roll on the date the auditor receives notice of the action of the board, except for the purpose of computing any debt limit referred to in Section 2052.