Brut and Clubman are traditional fougeres, along with Canoe and things like Trumper Wild Fern. They are absolutely similar, but certainly not identical.
Both are in my rotation and I don’t really sense a similarity. They’re in the same family, but definitely different enough.My wife insists that Clubman IS Brut. my Recollection of Brut back in the 70’s is pretty darn close to Clubman. i smelled Brut recently in a store and it’s a little different.