Well the main difference is the Ohana is family style and Kona is a la carte.
At Ohana you get coconut pineapple bread, scrambled eggs, pork sausage and smoked bacon, island style fried potatoes and mickey waffles.
All items are all you care to eat.
Kona has a broader selection of menu items from a traditional breakfast platter, to Tonga toast, banana stuffed french toast tossed in cinnamon sugar, and macadamia nut pancakes with pineapple sauce.