Mallory Electric Fuel Pump/Fuel Compatibility

I was considering picking up a seal kit for my Mallory 140 electric fuel pump before these pumps and kits become obsolete and noticed they have two version of these kits - one for "gas" and one for "alcohol/methanol." The alky version is $42, while the gas version is $130.

Mallory 29819 Mallory Seal Kit, Alcohol/Methanol

Mallory 29809 Mallory Seal and Repair Kit, Gas

Intuitively, I would think the only differences would be the material used for the thin o-ring and the gasket. Can you think of any reason the cheaper alky version won't work with gasoline???