You will need to be more precise, the shafts the props fit onto have different amounts of teeth and diameter. Normally the change point is around 70 hours with most engines, below might be 13 spline above 15.
Also going from a 13x15 Yamaha aluminium I had to drop two inches of pitch when purchasing a solas ss, so went to a 13x13 solas which brought my rpm up slightly but increased performance at all rpm, holeshot was greatly improved.
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