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You are wasting your time as you have no hope of matching darks to lights on one night let alone different nights. Leons advice is good, use ICNR (In Camera Noise Reduction). It gets worse if you chuck the lot in to a bit of software you will get a result. It will be nothing like as good if you sift through your images to get the best, and the sift through the darks that at least seem to match.
Bert
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