I don't know of any existing tools. As long as you don't want to see the rendered version (what an ereader would display) a recursive diff could be written in Python. Much easier if you don't want a GUI, just a simple file by file report. I'm not sure what modules are already available for diffs using Python, so how fancy would you like it?
Not that I'm personally promising... Just trying to figure out what's wanted.
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