i can hear a difference between the Dimebucker and the Warpig cleans... the Warpig ones simply sound better, more life in them. i haven't really got a good amp to try clean tones with, but from what i've been hearing so far, it's great. they do distort if you have slightly too much gain, but nothing the gain knob can't handle. i don't use clean much anyway, so i'm not the greatest judge.
i'd expect it to be down to the amp. i'll report here when i get a speaker cable for my new amp and cab, on both clean and distorted. bear in mind that my new amp is SS though, for awesome death metal tones.