Yes, they both offer breakfasts, but they are not the same. Ohana's bf is a character breakfast served family style. The characters are Chip n Dale, goofy and I forget who else. The food is ok - scrambeled eggs, mickey waffles, breakfast meats, etc.
Kona cafe is a menu breakfast and is EXCELLANT. Best breakfast I've had WDW. Lots of different choices. really yummy french toast. One of Disney's best kept secrets.