How so? All you've done is change the ending. Doesn't matter what endin' you add onto it, -a, -az, -uh, etc; its all derived from the root word nigger. Changing the endin' doesn't make it any less derogatory.
Regardless if it derived from the same word, later on down the line the track split my freind and they went to two different destinations.
Theres no way in hell they posses the same meaning.
Never.