Manga scans are basically scans of manga pages that aren't officially sanctioned. They might have issues like bad resolution or incorrect translations. Official releases are the legit ones, with better everything - quality, accuracy, and support for the creators.
Manga scans are like unofficial versions of manga. They're usually made by scanning physical copies. Official releases, on the other hand, are properly licensed and have better print and translation quality.
Manga scans are basically unauthorized digital copies of manga. They're different from official releases because they're not authorized and often of poorer quality.