Should be close, I always check the Histogram, as I said, just take a couple of JPEG's to check it is over to the right by about 1/3rd then take your RAW's.
I also re-read your question, your Darks are always the same length, ISO and temp as your Lights, I think maybe you are refering to Bias shots, they are always taken at the shortest possible exposure with the lens cap on, they are not temp dependant but must be the same ISO as the remainder of your shots.
Not sure what program you use for combining, aligning etc, I use ImagesPlus 3.50 and everything is automatic.
Cheers
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