Yeah, I did a little digging before I got bored with the research. DIN 73379 seems to be a "family", and it all comes down to the "Type".

I got tired of digging into it before I got to the bottom of exactly what "Type B" was. Some of the types are clearly suitable, but not sure about "B", The working pressure is certainly suitable, but I'm not sure about the permeability or longevity at temp.

"Proof is left to the student"? Can I pull that?

Here is what I found...  Because of location, the hose should be of Type A as that is fire resistant.  Type B is meant to be used to connect to the tank, as an example.

The search goes on...