There was a lengthy discussion of 'Frankie and Johnny/Albert' on the Ballad-L site some time ago. Reference was made to a study of the ballad: Bruce Buckley 'Frankie and Her Men' Indiana University 1962. Evidently, Buckley lists 410 verses for 'Frankie', of which 256 are substantially different. Sounds like it might be worth seeking out. I noted a gloriously defiant final stanza that someone posted:

Frankie stood up in the courtroom
I'm not talkin' no sass
I didn't shoot Johnny in the first degree
I shot him in his big black ass
He was my man
He was doin' me wrong

--Stewie.