No such thing as an "automotive" flare. No such thing as "gas line" flare either.
There is SAE 45° flare and JIC 37° flare.
Hydraulics use 37°. Can you use a 45° double flare..... yes, you can. It doesn't match, but I've not had issues doing it in low pressure applications. I will however say, it is better to use the correct flare degree. I can't guarantee you no leaks if the flares don't match. Make sense?
I don't know what tools you have, but if you have a tool to double flare, it wouldn't matter which degree cone you use after making the "bubble" for the double flare. I don't know what tool you have that you think is for gas line, but if you mean for flaring copper for LP or NG, that would be 45°.
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