I have the Romeo record of the Carson Robison trio doing My Pretty Quadroon. There are audibly slight differences from Jim's lyric, for example:
"shone on no darky like me" ("other" left out)
"comes the sound of the hue and the drum"
"she had lips like the blossoming peach"
"farewell to the little corral [sp?}"
"and my heart will find rest in the tomb"
"but my spirit will fly to the spot"
"O God, can it be the glad day"

There is another version apparently by Robison and Billings with the same wording but different verse structure. It seems they must have run down the street to ARC the day after doing this one.

These are obviously minor differences.