Well, the force with google is pretty strong, despite all of its controversies of late.... it's got noise levels on victor1, charlie1, yankee and delta2. (i see its already been mentioned in one of the threads here!)
https://apps.dtic.mil/dtic/tr/fulltext/u2/c010105.pdf
Made them into a graph.
The report unfortunately only said victor and charlie submarine, and as of 1977 there're both victor 1 and 2, charlie 1 and 2. Assumed 'twas victor1/charlie1 since their curves are smooth and beautiful, while the newer Deta2/Yankee's curves are a bit rugged, so guessing the victor/charlie had a lot of samples to average out the data.
Anyway the most important thing I learned was one sub could be quieter than the other while slow, but noisier when fast, when comparing yankee v victor/yankee v charlie. Also the victor is just quieter than charlie at all ranges which in CW they have the same noise. hmmm...