i am allmost certain the 2 new ons are Yamaha
i got one of these black steel yamaha props my self an it looks just like it!.
the omc prop has a littel more rounded splines than the Yami
the omc prop has short splines 2 inch long
Yami has somthing lige 3 ore more.
look in the propeller from the motor side the splines starts long up on the omc. right???
sorry my english im from denmark