I had a very simple "remove everything of the core rogue from the unchained rogue, add ninja", it's not good though.
Rogue -> Ninja
Knowledge (dungeoneering) -> Knowledge (nobility)
hand crossbow, rapier, sap -> kama, katana, kusarigama, nunchaku, sai, shuriken, siangham, wakizashi
Trapfinding -> Poison Use
Evasion -> Ki Pool
Rogue Talent -> Ninja Trick*
Danger Sense -> No Trace
[@ 6th level] -> Light Steps
*since the Unchained Rogue has all rewritten Rogue Talents, it might be advisable to either use those or rewrite the Ninja Tricks.
Those are all the differences I can spot.
|j b 200|