A decent amount of the extra square footage it is in the bathroom, but the living room is a little wider as well which makes it feel more spacious. The quality of the rooms is the same- both had soft goods refurbishment in 2016.
Two other differences:
-The master bathroom at Jambo only has a tub/shower combo while Kidani has a separate jacuzzi tub and glassed in shower.
-All
DVC rooms at Jambo are on the 5th floor. For Savanna view, I think it's nicer to have a lower floor.