It is a common problem. "origin" is more "spiritual origin" or "country where it was originally designed" than build location.
I would list the Hino Renault as origin=France (as the car was designed there) but "made for=japan", as some details change.
For the other one, if it is the same car (i.e. same body style, etc.) simply built in Japan, I would maybe keep the original country flag (UK/US).
I notice that all except 2 Hino Renault are currently listed as origin=Japan, though.