Agreed, the styling usually is not very different. The titles 'Duke of Parma' and all the other Italian and Spanish titles are not recognised by law. But there are 'heads' of noble families in the Netherlands. They usually do not have a special distinction indeed, though in some families the chef has a higher title than the other members of his family. For examples; the van Zuylen van Nijevelts of Duinrell amusement park. The head of the family is Count Hugo while his son is Baron Philip (married to the grand mistress of the Court btw).
Despite there not being a clear destinction, it is clear that for example Frederik, Graaf van Lynden van Sandenburg is the head of his family, and Arent, Baron van Wassenaer is the head of Holland's oldest surviving & most prestigeous noble family. The main branch of the Limburg-Stirums has been living in Finland for some generations.
Note that in the interview with the Volkskrant, the director of the counsel of the nobility explicitely mentions that there will be two
heads of the Bourbon-Parma's. It seems that for the Dutch counsel of nobility the eldest son will be the eventual head of the Dutch noble family de Bourbon de Parma, while for the family itself prince Carlos Henrique will become the head of the Royal house of Parma. Note that as a side snipe he also -wrongly- mentions that the family is not entitled to call themselves royal.