Is "Railroad Bill" a cleaned up version of "Wild Ni**** Bill"?

See this poem that is included in Thomas W. Talley's now classic 1922 collection "Negro Folk Songs" {Kennikat Press edition, 1968, p. 94}

WILD NEGRO BILL
I'se wild Ni**** Bill
Frum Redpepper Hill.
I never did wo'k, an' I never will.

I'se done killed de Boss.
I'se knocked down de hoss
I eats up raw goose widout apple sauce!

I's Run-a-way Bill.
I knows dey mought kill;
But ole Mosser hain't cotch me, an' he never will!

-snip-

Btw, Talley {an African American professor at Fisk University} wrote in the introduction to his 1922 collection that many of the songs in that collection were quite old. For this particular example, Talley used the "Negro" referent in the title, but spelled out the "N" word in the poem {song}itself.