The 1946 version is basically the original work, but the large-scale aspects of the book are not photographed.
One difference is that at the end of the book, the author doesn't explain the meaning of the title, but the movie, through John Garfield's lines, says it. Those who haven't read the book may think it has a didactic element, but I think it is an interpretation of the book. If you only read the original book and haven't read the translation or the translator's foreword and postscript, you will be confused about the title of the book.
This is the end of the film :
[I really like the interpretation at the end of the film, this is not in the book] The whole thing is like you are waiting for a letter, stay in front, lest you hear the doorbell, but did not expect the postman to always ring Twice the bell. He rang Cora twice, and now he rang me twice. In fact, people always hear the bell the second time, even if you're in the backyard.
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