I am not sure if there is any significance to the -S, B-S, or -H after the resin type E-765 in the name of this prepreg carbon.
Here is the information I have for the product description on the label for each roll:
E-765-H C24T700150 (Not sure what C24 means either. I believe it’s 12k due to the T700 in the info)
E-765-S 12K2X2385 (12k 2x2 Twill)
E-765-B-S PW3K (3k Plain Weave)