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Para os 3 primeiros livros, alguém compilou uma lista completa de todas as diferenças "Harry Potter e a Transfiguração da Linguagem:".
Como você pode ver, a diferença mencionada por sua pergunta é a única grande discrepância significativa nos três primeiros livros.
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Além disso, não existem grandes diferenças nas listas de diferenças do Lexicon para # 4 : GoF , # 5 OoTP
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# 6 HBP tem uma diferença significativa:
'Come over to the right side, Draco, and we can hide you more completely than you can possibly imagine. What is more, I can send members of the Order to your mother tonight to hide her likewise. Your father is safe at the moment in Azkaban...when the time comes, we can protect him too... come over to the right side, Draco...you are not a killer...' (UK edition pp. 552-553)
vs.
"He cannot kill you if you are already dead. Come over to the right side, Draco, and we can hide you more completely than you can possibly imagine. What is more, I can send members of the Order to your mother tonight to hide her likewise. Nobody would be surprised that you had died in your attempt to kill me -- forgive me, but Lord Voldemort probably expects it. Nor would the Death Eaters be surprised that we had captured and killed your mother -- it is what they would do themselves, after all. Your father is safe at the moment in Azkaban...when the time comes, we can protect him too. Come over to the right side, Draco...you are not a killer..." (US Edition pp 591 - 592. bolded text is added in US edition)
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# 7 DH não há grandes diferenças novamente.