Proof that there is a difference.. at least according to this site: it is all in the chromatogram!

(note.. I know nothing about chromatograms, but.. maybe someone here does)
http://en.wikipedia.org/wiki/Chromatography
http://en.wikipedia.org/wiki/Thin_layer_chromatography

Vitamin C - Ascorbic Acid (left) / Acerola (right)