Well with kiteboards there is hardly any rocker becuase you are cutting through the water unlike wake boards where you are skipping arcoss. Most of the differeance between the 2 are shape, profile, rocker, concave and flex. Wake boards will have more flex for that load and pop but the kite boards will be a little more stiff for better tracking through ruff water and holding down your kite better and keeping up wind. The more rocker you have; the harder it is for you to say up wind. But more rocker more pop, so there is a fine line when it comes to a good kiteboard. I hope this makes sense.
But over all the constrution is about the same.