Gas valves have a few common descriptors, like inlet pressure, BTU rating, connection sizes, but I think its worth going with the manufacturer's pick, even if its double. You will only have to buy it once for fit, and if you have a near-end-times event, the courts might not view you as an inventor/cowboy.
Motors, light bulbs, contactors...general purpose.
Gas valves...definite purpose.
.......JMHO.