Why one episode from the same show is narrated exactly the same but by 2 different people?

I have seen different episodes in exactly the same show ,either cartoons,or crime show or just different shows ,and been created the exact the same way the only difference was that it were narrated by different people.For instance in the show I shouldn t be alive ,an episode is displayed identical for the second time but have a different narrator .i remember every detail nothing has changed,only the narrator.why is that? 

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