I've looked at your photos and perhaps I am missing some details in the poor photos, but it would seem to me that your fork is missing the distinguishing two drill holes in each side of the fork crown (which are filled in with yellow paint on Greg's bike), Likewise the headlugs on your bike do not seem to have the same shape as those found on virtually all Colnago frames. The BB shell does look similar, especially as far as the drilling goes. I would be interested in seeing the brake bridge and chainstay bridge in close-up to compare.