from one of the videos in the other thread:
S-Thunder's gas grenade ***PERFORMS BETTER THAN OTHER AIRSOFT GRENADES*** and are made to be used continuously in Military Training, War Games, MilSim, Tactical Training, Entertainment Production and even RIOT CONTROL in streets and even prisons!
The standard grenade comes with a gas core suitable for top gas / green gas, but a "replacement" CO2 core is available for the much "higher" powered CO2 gas!
Compatible for use with all 40mm grenade launchers, S-Thunder's grenades can shoot projectiles up to 130 ft (40 m) with CO2 gas.
they are the same thing. likely from the same factory.
not feeling the need to purchase the upgrade CO2 valve.