Here you go Paul -
VOTC Stormtrooper, Comic Stormtrooper, Tin Stormtrooper -
Comic Stormtrooper, Tin Stormtrooper (I put a Tin Stormtrooper body for each one to show only the helmet differences) -
This one is in black and white in case the colors of the Comic Pack one are distracting -
To me at least, the comic one is not as defined of a sculpt... it's like its cheaper made or something... and the colors certainly don't help. The other thing is that is doesn't have the little stripes running alongside the "cheeks" of the helmet.
Hope that helps some!