Not the Same
The Vintage club is comprised of Any AS's that are over 25 years old. They do have affiliate members that do not own Vintage units but are members of the WBCCI.
The Classic Club is comprised of any Airstream that is the classic shape, They do not allow Square Stream, Landyachts, Cutters, Sky Decks, Integrities, and any other AS that does not have the "Classic" look of of the Torpedo or Tin Can.
I am not certain if they allow Argosies or Wide Body Airstreams.
We have several CC members in our local WBCCI unit.
I will ask some questions at the next rally.