It’s most definitely position, but I’ll wager Ernie Ball music man technical Support would be able to give you an answer regarding voicing..
As far as I remember (think I read somewhere) apart from the position, in Specials pole pieces are aligned differently in order to be placed directly in the middle under the strings.
Since the distance between the strings narrows going from the bridge to the nut, pole pieces wallows that lines, so the pickups are different in terms of the position of the pole pieces (I can't guarantee it, but I read somewhere).
In addition to this topic, yesterday I had the chance to play two new Special 5H, so I made a short video in which I compare the sound of Maple and Ebony Fingerboard.
Hope You will like it