Here are some key differences:
* The movie condenses the story: The film combines the plot of both novels into a single, shorter narrative. This means certain events are omitted or combined, and some characters receive less development.
* The film changes some details: There are differences in character motivations, relationships, and the timing of events. For example, in the film, the Païs family's schemes are revealed earlier than in the book.
* The film adds new elements: The movie includes some details and scenes not present in the original novels, such as the extended sequence where Manon is shown as a young girl.
* The film's tone is different: The movie is generally more dramatic and visually striking than the novels, which are known for their lyrical and poetic prose.
Therefore, the movie is a good adaptation of the novels but does take some liberties with the story. It's still worth watching if you enjoyed the books, but be prepared for some deviations from the source material.