1. Different contents: Hong Kong's collection mainly includes Hong Kong's classic literature and ancient books, while Macao's collection mainly includes Macao's classic literature and ancient books. Therefore, the documents and ancient books involved in the two collections are different.
2. Different languages: Cantonese and Chinese are the main collections in Hong Kong, while Portuguese and Chinese are the main collections in Macao. This is because the language habits of Hong Kong and Macao are different, so the languages of the two collections are also different.