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Done reading an watched the movie too. I forgot there were Hungarians in the production crew.
Yes the film differs from the novel, but also follows the events faithfully. The chief discrepancy is the killings, as you said the hero takes care not to kill anyone (directly).
The book is a great struggle between the two heroes. The translation is a bit clumsy but better than the second one (what I read previously).
And yes. The ending is not permissive regarding to sequels.
Now I read Tarzan. Well, a Tarzan novel.