Okay, this is only my own opinion, but it's also how the Roud Index works.
The 3 separate ballads are
The farmer himself is the hero
The farmer's daughter is the hero
Yorkshire John is the hero

There should be 3 Roud numbers but I'll check this. Off the top of my head they have no text in common other than the odd word that you would expect in songs dealing with the same story. In my book that makes them separate songs. If you really need it I'll check out their differences and post.