General manager Billy King announced the moves on Wednesday.
Owens has been playing for the Tulsa 66ers of the D-League. He has appeared in 12 career NBA games during the 2010-11 season with San Antonio and Washington, averaging 3.3 points and 1.3 rebounds.
He's averaging 13.2 points, 5.2 rebounds this season with Tulsa.
Horner, a rookie from North Carolina State, signed with the Nets before training camp from the their D-League affiliate, the Springfield Armor. He scored four points in five games with New Jersey this season.