Helianthemum confusion

I have a lot of helianthemums (rock roses) but not all have labels. I've managed to identify most, but does anyone know if Ben Moir, Ben More and Ben Mohr are actually the same plant? The descriptions I can find all sound very similar. I seem to have a Ben More and a Ben Moir which look identical.

 

The RHS Plant Finder lists only Ben More so I guess the others are mis -spellings. It happens all the time and even big, famous nurseries are guilty of using wrong names or even inventing them