1st is ccd, the second a dslr, a non modded one at that.
The well depth in a ccd gives a better chance at capturing star color, plus if it's a mono camera then all sorts of tricks can be easier applied for color details.
I do tend to think the second image could have been processed better, the first looks look a greater effort has been made. Perhaps the dslr image is an old one from the past and your processing skills have upgraded as well.
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