I thought that green gas is pressurized lower than propane.
I think one of the green gas containers is pressurized at 115 psi and a tank of propane at 130 psi.
Anyways, shouldn't really matter that much if you tune your gun to handle the high pressure gasses. As Drake said, the only ones you should worry about is the Japanese guns with plastic components for green gas. Even then, depending on what the gun is, they generally last a while on GG
"May you fight with the strength of ten full grown men."