All the blades for the head are the same, where in the original the ones on the bottom have different shape. 'The same' also means, that when assembled, they create a shape of...a fan. Yes. So when you look at the front, the left top wing should be flipped horizontally like in a mirror, so you get a right top wing and the bottom ones - as mentioned - should have different shapes (plus of course, left and right version).