Interestingly enough, I think BoA’s Japanese discography in particular has a higher ratio of the producer and arranger being different.Oh, got it, thanks. I never think of arrangements when speaking of song production, especially since they are rarely done by people who differ from those who produced the music.
It seems typical that it’s the same, or that the credits don’t make a huge distinction and that everyone who worked on the music is just listed as such. But maybe 50% by of some Avex BoA albums have songs where there producer and arranger are different.