Hi there,
Sure - the Sky Wing straps are M6 x 26 - whereas the Windsurfing screws are M7 x 28 - the first pic in your link is from the windsurfing straps, which has an anti twist system foostrap plug. Unfortunately since the Wingboards are not made at the same factory as the windsurfing boards, this anti twist plus is/was not available.
So the Sky Wings do come with the metal plate yet, which allows the back strap to be used with 4 screws, or the front straps with single screws on each end. Hope that helps,