No John you dont need to take the same number of darks to lights but in general taking between 5-10 darks is recommended no matter how many lights you take.
For example I may take:
30 light exposures
5 combined Darks
5 combined Flats
10 combined Bias frames that I use on all my shots....I dont take these Bias frames every image....about every few months I update these.
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