Talking to a mate who has 20,000 hours the majority in command on a widebody but included 737 and some earlier turboprops. Much of that as a check captain until the last ten years teaching Asian cadets with only Cessna 172 CPL time in their log books. So their initial twin was a 767. His job entailed both simulator instructing and instructing (line training) these youngsters on the real aircraft..
None of this instructional experience means anything to Australian or NZ regulators who require him to undergo from scratch a full junior grade three instructor rating course (Cessna 152 single) in order to qualify as a junior instructor at a flying school. Mind you, it has ever been thus. Experience counts for zilch.