The mountain rating is a very "national" subject. The Swiss one only allows you to land on (Swiss) glaciers - and requires a minimum of 250 (!) landings on ten different sites over two years (so you face a full variety of conditions).
Mountain flying (sans landing) is part of the Swiss PPL training curriculum though.
The French MOU rating (like the Swiss one) is only valid in France - but there is a vastly higher number of surfaces you can land on.