Wow I guess no one remember when Minato clearly states that he sealed away the the 9tails dark chakara so that Naruto could posses and control it the 9tails light chakara. Think about it for a second, why do you think Naruto's cloak is so full of life? Remember when Naruto was around the Zetsu and the trees started to grow from them, the same as Yamato's mokuton as well. The reason why Naruto's KM/BM looks so different is because of Minato sealing away the dark chakara of the 9tails which only left the yang chakara. Which yang chakara is full of life force and pure energy.