Well those helmets are high-poly made only for preview purposes which may end up being used in loading screens and concept art.
They also use hi-res textures(i.e. 1024*1024 which is half the size of a unit texture, 2048*1024) so in game they won't look like that and will only be used by general or officers(as they use 4096*2048 textures).
So the low poly version would look like this(of course with reflection replaced by the game):
In conclusion the specs should be similar, but higher, than those of M2TW.
I hope that clear things up. :)
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