Other than the heavier and stronger wheels are the Tour of Flanders bikes the same as used in the TDF or are they using a slightly heavier and stronger bike also.

This article does a good job of showing how the teams prepared for the cobbles. (http://www.cyclingnews.com/road/2008/apr08/rvv08/tech.php?id=/tech/2008/features/flanders_tech108)