Thanks for the pictures, but no, Napoli has the incorrect walls there, not Calatrava. The color and tone of the towers match with the Iberian castle (and especially the tier 3 and 4 Iberian walls). They might have done that intentionally since Mediterranean walls are not unique for tier 1 and 2, but the coloration is very different for Iberian walls and Mediterranean castles.
You can really see the color that regular Mediterranean walls have when looking a tier 3 (Rome) and tier 4 (Constantinople) at game start.