Knightmessenger said:

If someone was to overlay the fullscreen image with the widescreen one, what aspect ratio would that measure out to?

It wouldn't be anything. Neither would fill out the other to the corners, so you'd just get a cross-shaped image.

The very last image does lend some credibility to the claim of a wider aspect ratio...notice the left side is pan 'n scanned further to the left than the widescreen version actually shows. So there's definitely image info available that isn't being presented on the 1:85 copy.