In my opinion it’s not the same actor who plays the inspector.
I found Chiappa in a minor role, so the only possibilities among credited actors are Filippo Antonelli and Arnaldo Mangolini: considering that there’s a painter with the same name born in 1958 and since Arnaldo was credited in the Art Department in a 1976 comedy he could be the young cow herder who saves the Stranger.twice, but for the moment there isn’t a confirmation.