Why are the 11.75 Brake Better?

I searched Hawk's website and can't find anything for classic Mopars. I know EBC sells pads for them though. Dr. Diff includes pads in their kit I might send an email and ask what brand/type they are.
Summit lists them as available, special order $79.89 Search for 78 Plymouth Fury (pin type). That is what I use on the 67 Barracuda.

1978 PLYMOUTH FURY Hawk Performance HB643F.595 Hawk Performance HPS Brake Pads | Summit Racing