Bryant wore No. 8 from 1996 to 2006, then switched to No. 24 from 2006 until his retirement in 2016.
The NBA granted Dinwiddie permission to make the swap despite the league's typical protocol of making players wait until a new season begins to make such changes, The New York Times' Marc Stein reports. The league will review players' requests to change from No. 8 or No. 24 to a new number on a case-by-case basis, Stein adds.
Orlando Magic swingman Terrence Ross quickly followed Dinwiddie's lead, changing from No. 8 to No. 31, the team announced. Ross previously wore the latter number until the start of the 2019-20 season.
There are 21 players who have regularly worn No. 8 this season, while 12 players currently don the No. 24, according to Basketball-Reference.
Trae Young became the 22nd to wear No. 8 this season when he paid tribute to Bryant on Sunday.
Dallas Mavericks owner Mark Cuban was the first to honor one of Bryant's jerseys numbers after his passing, announcing that no player in his organization will ever wear No. 24 again.