Here is another thread with good info:
www.hellcat.org

What’s the difference between the 6.2 vs 6.4 short block...
It looks like both have cast pistons and rods. Procharger says their supercharger is designed for the 392 and the latest design does over 200hp putting it in HC territory and the SP already has the 3.09 LSD rear. What am I missing?