No expert but...
In the QuikWars rule set, all you are doing is seeing who rolls higher, so it doesn't matter what you use for dice as long as they are the same.
However, the rule of Heroic feats is further explained in the Heroes section of the 2005 rules sets. Although Heroes have a skill of 1d10, it states:
"To attempt a Heroic Feat, the player describes the Feat his Hero is about to attempt, and rolls 1d6. If one of his opponents would like the Feat to fail (and they probably will), he also rolls 1d6. If the Hero's roll ties or exceeds the opponent's roll, the Feat succeeds; otherwise the Hero's efforts end in failure."