I was interested myself, and a Google search for "is coke zero diet coke" showed me: > Coca‑Cola Zero delivers the great taste of Coca‑Cola, with zero sugar. W

I was interested myself, and a Google search for "is coke zero diet coke" showed me: > Coca‑Cola Zero delivers the great taste of Coca‑Cola, with zero sugar. While it has the same sweeteners as Diet Coke (a blend of aspartame and acesulfame-K), it has a different flavour base, though both are low calorie and zero sugar.