It depends on the cafe, a cortado will almost never come in a 16 oz cup. It could if they wanted to brew up 8 oz of espresso and serve it with steamed milk, but yeah, otherwise it’s just a “latte”. Lattes also don’t traditionally come in a 16 oz cup if we’re talking about the strictest of Italian classic coffee bevarages. From a technicality standpoint, a latte is a 6-8 oz coffee drink

A flat white is like a latte but smaller (traditionally around 5 oz). It doesn’t contain less espresso than a latte, just less milk. A cortado is even less milk than that, it’s about a 1:1 ratio of milk to espresso. Cafes may add an extra shot for those larger sizes, but frequently it just means extra milk