Hi Barry
Straight up 'guessing' is going to get you in trouble. When it comes to motors it is not just can diameter or even length that will determine amp draw. To start with, manufacturers specs are just that. More pertinent is wattage rating. There are differences within motors that will have an effect on efficiency and current draw, such as how much copper wire is wound in them and the strength of the magnets.
However, on the water it comes down to a combination of hull, motor, prop and how well the whole setup is tuned. Put the wrong prop on and you will find current draw increase dramatically.
BTW the SSS may well be more efficient than the Leopard, but in lieu of proper testing that is all conjecture.
Ask more questions specifically around what you want to build and achieve. There is a huge amount of experience and good advice here on OSE.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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