Not too many silimarities but you can see how these two men scream in a similar manner and when they made solo vocals, the choir would respond to them.
Let me reveal one thing, Sisi Silvi song that Koffi did in 2005 was a combination of two songs here from Monde Arabe
Sisi Silvi
The songs from Monde Arabe
Sylvie
Eputsha