If Naruto charges in at K bee without Sage Mode hes done for.
If Naruto uses Sage mode he can win. Why K Bee has swords (which wont pierce Naruto unless he combines them with lightning) and Samehada would be useless because Narutos Chakra is from Nature (unlimited) and Samehada would react in a negative way since it doesnt have (probably) the capacity or experience absorbing Natural Chakra thus turning it into stone (not frog) and Naruto would also have superior speed, strenght and not to mention Chakra amount
So Naruto would be my pick as long as he doesnt slack off