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The ICX285AL (colour) is a newer, better sensor. That's why it's more sensitive. That said, it doesn't change the fact that each pixel will lose ~2/3rds of the signal hitting it because those photons will be of the wrong colour and will be absorbed by the filter sitting above the pixel.
I'm not sure what Ray's saying about galaxies looking bigger with more pixels - I guess you can digitally "zoom" in more with more pixels, but the resolution is set by the diameter of your scope and the image size by the focal length...
One thing not otherwise mentioned here is that the 314L has a physically larger chip, and that means a larger field of view. That will likely make it easier to frame your target and give you more options for things to image without having to take mosaics.
Hope this helps,
Cam
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