Campag Chainset query

GordonH

What is the difference between a Campag Veloce Ultratorque chainset and a Mirage Ultratorque chainset? Someone is selling new 53/39 Mirage chainsets for £46.95 on fleabay and I'm wondering whether I can save £55 by buying one of them as opposed to a Veloce chainset. The Mirage crank length is only 170.mm, but I doubt that I'd notice much difference in a 5mm reduction in "pedalling diameter"...