Same art different artists

For months now I am trying to find more art from artist Sao-Chang (who illustrated a lot together with Lany-R, if they are the same I don’t know).
Just now I came across two artworks. One by Sao-Chang was illustrated for the book Les Asservies de Slave Island (1935) but it seems these were inspired by art done by René Giffey for the book Cuir & peau (1934)