I can see interconnects having more of a likelihood of being distinguishable than speaker wire, but even so, if two different interconnect manufacturers have provided a quality built cable which meets standards for it's intended purpose (if standards even exist), I can't see how the difference between them would be readily obvious in DBTs unless one of them is, in fact, defective.
I could possibly see this phenomenon being more likely in video cables, but even then, if the cables are built to a specific standard, are tested in a manner such as Gene or FMW suggested and are not defective, the differences should be subtle, if distinguishable at all. The only impact other than poor build quality or the product being defective I could possibly imagine would be the length of the run or any possible interference with the cable performing it's job... -TD