For the 1/2 VW engine, Great Plains sells the Zenith model 11, and Hummel Engines (Scott Cassler) sells the Zenith 13922. I can't find a lot of information about the model 11, and can't find anything at all about the 13922. Are these different part numbers for the same carb? If not, are there any pros/cons to the two, or are they similar enough not to make a difference? I would be putting it on a Global 35hp engine.