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Realize that the Superb is just a rebadged Passat/A4... Skoda is part of the VW Group. >>
Subsidiary of VAG? Yes. Rebadged Passat? No. They share many of the components, and they are based on same platform, but Suberb is NOT a rebadges Passat! For starters, Suberb has longer wheelbase than Passat does.
It's a similar thing as VW Golf/Jetta/Bora and
Skoda Octavia. They are based on the same platform and they share many parts (for example, dash of the Octavia is from Golf), but Octavia is NOT a rebadged Golf/Jetta/Bora.