From the No-Rosion home page:
"No-Rosion is a powerful, industrial-grade automotive cooling system corrosion inhibitor that stabilizes coolant pH, and protects all six metals most commonly found in cooling systems from corrosion and electrolysis - including aluminum."
From No-Roison pdf link:
"No-Rosion is formulated to provide maximum benefit to engines having mostly cast iron components, and radiators made of copper/brass. It is therefore formulated with IAT chemistry.
HyperKuhl is formulated to provide maximum benefit to engines having mostly aluminum components, and radiators made of aluminum and its alloys. It is therefore formulated with OAT chemistry."
It would appear that both protect cooling systems / engines that have aluminum components.
Just say'n.
John