There are Stingray's, Z06's, and C7.R's. GM distinguishes the Z06 from the Stingray, which is why it has Z06 where the Stingray emblems would be. It is built off of the Stingray platform, but they don't call it a Stingray. Just like you wouldn't call a Mustang Cobra a Mustang GT
GM uses this kind of text on their website: "the Corvette Z06 is distinguished from the Stingray with..."