the two cars share no common platform and are very different size-wise as well.
All of this information is easily found in this forum using the Search function. And it has been rehashed repeatedly as well.
The Audi Q3, a smaller SUV in the pipeline, is rumored to be Golf-based and might share some components with the Tiguan.
Sig Begins---
Handy Links:
Stoney's A6 FAQ
TT MkI FAQ
Vag Com Tool Locator
Ross Tech Vag-Com


Jack? It's the President. I need you.

"I hope we shall crush in its birth the aristocracy of our moneyed
corporations, which dare already to challenge our government to a
trial of strength and bid defiance to the laws of our country."
Thomas Jefferson, 1812
"I see in the near future a crisis approaching that unnerves me and causes me to tremble for the safety of my country. . . . corporations have been enthroned and an era of corruption in high places will follow, and the money power of the country will endeavor to prolong its reign by working upon the prejudices of the people until all wealth is aggregated in a few hands and the Republic is destroyed."
-- U.S. President Abraham Lincoln, Nov. 21, 1864
(letter to Col. William F. Elkins)