The results of the vote will be based on whether or not “3/4 of the returned ballots” are in favor or not of the proposed change, so the results are determined based only on a count of the returned ballots. After all votes are returned, MA World Services will count the returned votes, and calculate how many “yes” votes were received. According to the process set out in the Service Manual version 7.1, only if 3/4 or more of the returned votes are “yes” votes in favor of the proposed changes, will the proposed changes take effect. So while every single vote counts, and goes towards or against creating (or not creating) 3/4 in favor needed to make the proposed change, ballots that are not returned will be null, and not be counted.
However, each and every occurrence of a meeting is provided a vote, and so received a ballot, so it’s up to your group/meeting(s) whether or not to vote and return every ballot allotted to it according to the MA Service Manual, or to only return some of the ballots your meeting/groups received.