The website for swiss tells this story
Black powder has been produced in Switzerland since the Middle Ages. Initially by farmers, who operated the powder mills as a sideline to agriculture. The initially very poor quality led to the fact that many of the first powder mills were destroyed by explosions. In 1852, the 5 remaining powder mills were put under state control. In 1894, all Swiss powder mills were closed - except for Aubonne and initially Chur, which also had to be closed in 1976 due to the increasingly dense population. In the 1990s, the Poudrerie d'Aubonne was seriously threatened with closure due to economic difficulties. A joint takeover by the canton of Vaud and a private entrepreneur in 1996 saved its continued existence.
Wano's site simply states privately owned.
I can't find any indication that they are under the same ownership.