JT or Patterson might look similar based on statistics, but it seems to me, that Landry plays a different game underneath the basket. I can only judge round about 20 regular-season-games and the whole playoff-run of the Warriors this year, but it appears to me, that Landry loves to use his strength and loves to go full-contact, while adding a solid mid-range game too. JT and Patterson both play rather soft for a PF and dont use their body all that much. They rely almost entirely on mid-range-jumpshots and wide open layups.
So if its the goal to add some toughness and physicality to the Kings front-court, Landry might be a logical choice.
But my opinion is not backed up by stats, so i might be mistaken. We ll see.