Another such song which comes to mind immediately is the RDB "Kuch na Kaho..." sung by Lata Ji and Kumar Sanu.
No guesses for whose is a better renderition.
The height to which Lata Ji takes the song is just missing in Sanu's song. A well sung song.... but you hear Lata ji songs and the feel, the rich texture to the song is something else. It is almost as if the music takes a new life in that song.
Call me biased if you want..but I feel had Kishor Kumar sung the male version of "kuch na kaho"..it would have been a different story..
A very rich male voice can carry the song better than a female voice..