Those lines were also initially styled Highness and only given the style of Royal Highness in 1865.
Since the ducal line inherited the royal dignity (in pretense), they are entitled to the princely title and style even if they choose not to use it. It might have something to do with their civil name already having been Herzog(in) von Württemberg by the time they succeeded (and became) the royal line.
Could be. but then the civil name of the for example Duke of Bavaria (which is in his passport) is also Prince of Bavaria as is the case for many of the mediatized Fürsten.
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