Frogman, I will be more than delighted to explain; first, they both are of the same "genre", and that is "Afrobeat". Newen Afrobeat channels the music of Fela Anikulapo Kuti. He spent his life protesting oppression in Nigeria, his songs always have a message. Since I have been a fan of his music for many years, my ears are most receptive to Newen Afrobeat. Their music is actually more African than Kokoroko.
Kokoroko simply plays jazz with an Afrobeat. I don't hear an uncanny similarity between the two groups. Maybe others here, hear that same "uncanny similarity"?
It is foolish for one man to argue with another man in regard to his sense of aesthetics in music; much of the music posted on this forum makes my ears cry, but they like it, who am I to judge?