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Whats the scoop with these guys.....is this the original Heresy-era model (like the old Heresy Terminators) or simply a different armor pattern for them? Like....back in 30K they were more streamlined, mobile, with better loadouts, and nowadays in 40K times theyre big clunky boxes with feet?

From Wiki:

"A Contemptor Pattern Dreadnought is an ancient Imperial cybernetic combat walker used by the Space Marines in the days of the Great Crusade and the Horus Heresy, 10,000 Terran years before the present day. "

So basically, yep