Cinzano Rosso and Martini Rosso are not the same product, though they are both Italian vermouth-style aperitifs. Martini Rosso is the world's most popular red vermouth, produced by the Martini & Rossi company since 1863. It has a distinctive sweet, herbaceous profile with notes of caramel and spice, and is widely available globally. Cinzano Rosso is a French vermouth made by the Cinzano company, which has a history dating back to 1757. While both are red vermouths meant to be served as aperitifs or used in cocktails, they have different flavor profiles. Cinzano tends to have a slightly different herbal composition and sweetness level compared to Martini Rosso. Both can be used as substitutes in many cocktail recipes, but bartenders and vermouth enthusiasts generally distinguish between them based on their unique taste characteristics. Martini Rosso remains more commercially dominant and recognizable worldwide, while Cinzano maintains a devoted following, particularly in Europe. If a recipe specifically calls for one or the other, using the specified brand will provide the intended flavor balance, though in a pinch they are reasonably interchangeable for casual use.