the prop shaft is the same splines on the w25 and the mark 20 25 and 30 and kh7. drive shaft has the same splines as the mark 30 ant all the prop shafts mentioned.
Here is the funny thing. The mark 30 was advertised 30hp at 5400rpm, and wizard was advertised as 25hp at 4000rpm. I really don’t think there is a power difference between the 2.
The Wizard motors only used 4 reeds on the reed blocks of which there are 2 in the 4 cyl motor you have ( less fuel entering the engine) which makes less HP than the Mercury motors. Carl Kiekhaefer didnt want the Wizards to be as fast as the Mercury’s