The panino con capocollo calabrese is the version of cured pork neck where heat is part of the cure, not a condiment added after. Capocollo is the muscle that runs from the pig's neck into the shoulder, salted whole, seasoned, cased, and dried until it slices into rounds marbled with soft fat. The Calabrian reading rubs that muscle with the region's chilli and paprika before the casing goes on, so the spice cures into the meat rather than sitting on top of it: the slice is rust-red at the edge, warm rather than scorching, the burn carried through the fat where it lingers. That built-in heat is what separates this from every other regional capocollo, and it changes how the rest of the sandwich has to be set up.
The craft is keeping the chilli legible without letting it run away from the pork. The capocollo is sliced thin, but not to vapour, because a chilli-cured meat needs enough body that the heat reads as part of a slice of pork rather than a loose flake of spice. The bread is a plain crusted roll or the durum loaf of the South, deliberately neutral so it cools and frames the heat instead of competing with it. The classic build adds nothing, on the logic that a spiced cure is already a finished thing, but where a bridge is wanted it is a fresh foil rather than a second strong flavour: a few slices of mild provola or a smear of soft cheese to round the burn, never another cured meat or a sharp pickle that would crowd an already loud slice. The point is to let the chilli sit forward and the pork carry it.
The variations stay close to home and mostly concern degree of heat and what tempers it: the fiery build eaten plain, the version softened with caciocavallo, the spreadable cousin where the same chilli logic goes into 'nduja instead of a sliced muscle. The protected Calabrian reading and the other regional cured-neck traditions of Norcia, Tuscany, and the Valle d'Itria each follow a different spicing entirely. Each is one cured meat given its bread, and each deserves its own article rather than being crowded in here.