Well more the fact that he is a big tall Danish centre back than anything else.
Kroldrup was a good footballer. The heading thing is a myth, you don't have 2 successful stints in Serie A (when it was a decent league) and a bunch of International caps by not being able to do something as basic as heading the ball. Our fans (and Moyes himself oddly enough) made up their mind about him after 2 games. Very weird signing really.
Well as you say, I never honestly ever saw enough of Kroldup or this Vasternburger fella to know if they are similar and I suspect neither have you my frandelino.