There's still some major differences. Cuckzuya is just a virgin ass who never date anyone. Meanwhile, this kid already have fucked with her sister right in chapter 1, and everyone else in his harem eventually (according to author's fanbox).
The writing of manga is so bad that it seems like it's written by modern feminist novelists for Netflix romance drama (that is targeting towards woman audience). The translation is great though, thanks for translating it.