Is green hydrogen compatible with natural gas?

It is not directly compatible, but there is the possibility of combining it with other carrier molecules that would make it compatible through a process of methanation.
As an example, the use of biogenic CO₂ from the biomethane upgrading process is being considered since, as a transport element for green hydrogen, it can be used throughout the current logistics chain of the natural gas network, transported and distributed through the network, stored underground and consumed by existing equipment without having to make additional investments. In this case, it becomes 100% compatible with natural gas.