Only the torso is proven sandtrooper. And clearly parts from RS are mixed and used in several scenes, both in early and late recording, since tantive iv was one of the last. And you are right, it isn't the be all end all, but it's one of the best references we have since RS has put out so many photos of it.
Yes, all the suits differ from each other, that's what hand made stuff does. But you can't claim that the visible ridges are intentional when they clearly aren't. And the picture you posted comes from the LFL archives. We have a lower resolution one in our gallery.