Hi Sol88, I noticed that in the last post I assumed that the electric comet idea has comets with the same composition as asteriods. You have not disagreed with this so far. So here is the science (not as clear cut as the different densities of comets and asteroids
Physical composition of asteroids
Meteorites also suggest that "Asteroids are believed to contain traces of amino-acids and other organic compounds".
Physical composition of comet nuclei
This suggests that the composition of comets and asteroids differ in that comets have the addition of frozen gases while asteroids generally do not have frozen gases (but may have icy crusts).