Video: Comparison between Rotax 912S and Lycoming O-320 engines

The ROTAX 912S and LYCOMING O-320 engines have many differences, and therefore their propellers are necessarily different. Why, how? Jérémie Buiatti brings some elements of answer in this video :

One question remains unresolved : why are some propellers (not E-Props, I reassure you!), a priori “designed” and sold for the O-320, also sold for the 912S ? … lol…