Gee, Col; they rushed in with info, eh? Best I can find is ailerons all wings, larger rudder, different wing section. You know that though.
As for photos, if the Official sources fail, try the locals. Find where the Canadian barnstormers flew, check the historical societies.
Then use Search Feature for Curtiss Canuck. Ask the webmaster. If he has several photos.... might have more.
I found
www.wopmay.com
ww.peckaeroplanerestoration.com/robin.htm for a Robin of 1928, flying with a Canuck restoration. Pretty picture. Good bloke to ask? If the URL fails, go "1928 Curtiss Robin"