Visually they look the same other than color. The heads have what Mopar called "high speed valve train" whatever that means, then the oil upgrades, stronger parts supposedly like pistons and rods, etc.
My Hellcat blower bolted right on and with the 2.72 pulley makes about 16.5 psi of boost, so just a tick more than the Demon/RE 2.7L blower at 14.5.