[Dan Hibiki]

Dangit, Joe, you have your names all wrong, and a few Kame Hame Ha types that don't even exist as separate types! The "Fatality" version is called the Chou Kame Hame Ha, the Max Power Kame Hame Ha is only used by Jackie Chun to destroy the moon, Hana Gaeshi Kame Hame Ha is just a use of the Kame Hame Ha and not a separate type, Renzoku Kame Hame Ha is used while Goku is training in the Gravity room on his way to Namek (he fires it, and while it is being fired he moves his arms and changes its path to try to meet up with another fireball spinning about), the full name of the next one is Shunkan Idou Kame Hame Ha, and the Waza Kame Hame Ha isn't its own type of Kame Hame Ha, either.

<span style='font-size:7pt;line-height:100%'>Dan takes a breather for a moment.</span>

The only ones that you really got right were the Waiting Kame Hame Ha and the Ashi Kara Kame Hame Ha, and that is used but once in the 22nd Tenkaichi Budokai. The Magura Kame Hame Ha is actually a variation on the Renzoku Kame Hame Ha.

Now then... the answer is simple. Shinkuu Hadouken, in the story, is a single fireball. A brief burst of energy. Kame Hame Ha is a beam of continuous energy. The Kame Hame Ha could overtake any single fireball like the Shinkuu Hadouken.