I don't see much of a difference, they both have similar features, except the very top one has the mouth piece different then the ones at the bottom, which look painted from the angle shown.
Maybe I am missing something? All of those helmets are good, if the top one is a licenced version what is the problem with it? Better then what the licenced halo stuff looks like.(if what microsoft brought out for the halo launch is the licenced stuff that is)