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Roger, There is certainly more spiral structure present in the new image. Perhaps not as clean. You could have potentially stretched the first image a little more which could have delivered a similar result to the latest image, but with less noise. How far you can stretch the data signifies its quality. Short or lack of exposures will result it more noise when stretched.
You're not doing the entire LRGB process in CCDSoft are you? You'll find you will have much great control combining the lum and RGB data in photoshop. Simply register the two before opening them in photoshop otherwise you'll need to nudge (and/or skew/rotate) the layers.
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