Compare Marlow's differences in Heart of Darknes by Joseph Conrad and in the movie Apocalypse Now by F. Coppola?

I think that Marlow is shown to be different aspects of
the same form in Coppola's film and Conrad's book.  In the book, Marlow is sent to fetch
Kurtz, while the film is quite explicit about Willard needing to  "terminate with
extreme prejudice."  Another difference would be that Willard kills Kurtz at the end of
Coppola's film and this is not seen in the book.  Another difference would be the post-
Kurtz treatment in both.  In the film, we really don't see life after Kurtz.  Willard
leaves the compound, but we don't get the vision of post- Kurtz Marlow in the book, who
seeks out Kurtz's fiancee to protect her and say that he died with her name on his
lips.  Finally, Marlow is a detached Buddhist like figure in the book, while in the
film, we see him as almost as savage as Kurtz.  While we may feel many things about and
for Willard, seeing him as a detached sage is not one of those
experiences.