It would be useful to be able to compare any set of like texts even if printed in as comparison unfriendly manner as Gospel (Questions) of Bartholomew in James, Montague Rhodes, ed. The Apocryphal New Testament: Being the Apocryphal Gospels, Acts, Epistles, and Apocalypses. Oxford: Clarendon Press, 1924. I would accept as clunky a solution as manually feeding the texts into the comparison tool if the resultant text could be saved.