I don't see it beyond some bare cosmetic similarities. Especially since Bucky has become New Cap and has his own history. The Comedian was a brutal cynic; Bucky was brainwashed for his worst atrocities. Bucky genuinely tries to repent for his sins and live up to his legacy. The Comedian didn't.
Aside for the military origins, domino masks and a love of guns, I don't see many connections.
WATCHMEN may inspire a lot of writers, as it should, but in terms of seeing similarities, I recall a saying: " If you think like a hammer, everything starts to look like nails."