You have to consider both diameter and pitch, otherwise you will get into trouble fast. In your example, while they have similar pitch, the x447 could easily overheat a boat which ran an x642 because the diameter contributes more to the load. Once you understand how Octura lables their props it is easier to understand:
x447 means a 47mm diameter with a 1.4 pitch ratio (the x4 means 1.4). You take the diameter and multiply it by 1.4 to get the pitch.
x447 = 47 mm x 1.4 = 66 mm pitch
x642 = 42 mm x 1.6 = 67 mm
x647 = 47 mm x 1.6 = 75 mm
The number of blades has nothing to do with pitch.
When propping up, it is often best to stay with a similar diameter and add pitch. If you can't find a prop with the pitch you want in the same diameter, go up in diameter but watch the temps. The best strategy is often to copy what others have used with a similar setup, but be careful. Some folks say they use a certain prop - but don't tell you it overheated all their stuff....
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