I can tell the difference instanteously! At least, between the working style dogs of both breeds. With show BC's and Aussies, they look much more similar.
Merle is much, much less common in Border Collies. Even with a merle BC, there is a distinct difference in the face alone - with BC's having a longer muzzle, different eye shape and expression, and a different ear-set. BC's have a much more lean structure and are generally smaller. Not to mention their herding styles are very different! Aussies are more of a driving breed, and much more vocal, while BC's tend to be quiet and use their eyes while working.
I always thought Runner looked like an Aussie x Chow =P
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