Color and Film Question

In May, I took a wide-field shot of the Dumbell, and
though I didn't get much detail, it was pronouncedly
GREEN. I was shooting Fuji Superia 800. I just shot it
again with Kodak Elitechrome 400, and it was mostly
red (like in many pics I've seen). Is this just a difference
in color sensitivity between films?
Or is the F/stop and exposure time making
a significant difference as well ???

Attached Image:

This could be either a difference in the films' response, the printing/processing, or both. Planetary nebula are among the hardest because of the "OII gap." Most films seem to have low response to the OIII line and this is where a great deal of energy is emitted by planetary nebulas. This will throw the color off a great deal. A bad scan will also do this.

No real comparison can be made unless the background color of the two photos matches. To really compare the two you should reset the dark point of the original scans using the same color and using the same spot. Compare the colors, any difference will probably be due to spectral response.