I'm not sure why you are hung up on the "rated" voltage... Neu's, Castle's, etc., are all rated MUCH higher than most sensible boaters would ever run one...
Personally, I choose to use my own foundation in boating information to decide just how hard I'm willing to push a motor. Relying on "marketing" and "manufacturers specs" is likely to get you in trouble... or at least smelly and in need of some Scotch-Bright pads and some denatured alcohol...
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