http://variety.com/2017/tv/news/tnt-ncis-new-orleans-rerun-rights-1202643667/

TNT is expected to pay much less per episode of NCIS: New Orleans than it does for NCIS: Los Angeles.

Never expected TNT to get the off-network rights to NCIS: New Orleans, since the other two NCIS shows (the original and its Los Angeles spinoff) are exclusive to the NBCUniversal portfolio. I guess this is because USA probably didn't have enough room on its schedule for the New Orleans spinoff, and USA recently acquired off-net rights to Chicago P.D..