I read a few posts about this but still not sure so i will ask here.

[crew] => Array
        (
            [0] => Array
                (
                    [credit_id] => 52fe420dc3a36847f8000437
                    [department] => Directing
                    [id] => 1
                    [job] => Director
                    [name] => George Lucas
                    [profile_path] => /rJ1zvSeZfge0mHtLnzJn4Mkw18S.jpg
                )

            [1] => Array
                (
                    [credit_id] => 52fe420dc3a36847f800043d
                    [department] => Writing
                    [id] => 1
                    [job] => Author
                    [name] => George Lucas
                    [profile_path] => /rJ1zvSeZfge0mHtLnzJn4Mkw18S.jpg
                )

            [2] => Array
                (
                    [credit_id] => 52fe420dc3a36847f800045b
                    [department] => Production
                    [id] => 1
                    [job] => Executive Producer
                    [name] => George Lucas
                    [profile_path] => /rJ1zvSeZfge0mHtLnzJn4Mkw18S.jpg
                )

For movies/11/credits under credits/crew I see George Lucas show up multiple times. Each has the same object id but different credit_id for each of his different contributions. Is is safe to say that the Credit->Crew->id is unique to the person and the Credit->Crew->credit_id unique to the role that person had for that specific movie?

If the answer is yes, I would assume that all movies George Lucas directed, wrote or produced would have the same Crew->id but different Crew->crew_id. Can anyone confirm this?