Discussions are progressing with hopes of bringing a vote to the April meeting of the league’s Board of Governors that would introduce some — if not all — of these proposals into the NBA’s 75th anniversary season of 2021-22, league sources said. The NBA still has work to do coordinating with constituents on the myriad implications involving the proposed changes. The reseeding of teams in the semifinal round based on regular-season record could give the NBA a championship series that includes its best two teams. The WNBA has been seeding teams in the playoffs without regard to conference for several seasons.