As soon as the procedures prescribed by section 621 of this title have been complied with, the election officers and clerks who have been present throughout the election may be replaced by another set of election officers, who shall have the same qualifications, receive the same compensation and take the same oath as prescribed in chapter 7 of this title. The election officers shall open the electronic voting machine and the ballot boxes holding paper ballots and obtain the tabulations separately cast for election to the boards of education and elections from all other tabulations of ballots cast in the election; provided, that at primaries, the ballots shall be separated according to the political party to which they belong. The number of persons voting at a primary shall equal the total number of persons who signed the register at the polling stations.