jamdfingr said..
Difference between them is the hook.
A windsurfing hook is a 90 degree bend so that it will disengage the harness lines on the boom quickly. A kiting hook wraps around a bit further than 90 degrees to keep the chicken loop locked in. You can use a windsurfing harness for kiting, but typically not the other way around.
Pretty sure that is definitely a kiting harness....
generally correct but not just the hook, all my kite harnesses are more beefed up than any wind surf harnes I have owned.