The six volt switch will be heavier duty than the 12 volt one. You will be able to use it no problem.
That is a good catalog, haven't heard of them before. That may be another good parts source for all the fellow stovebolters.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.