Put one of them in a zip file and attach the zip file?
Have 2 separate "book" entries with separate titles. ie. "Book 1 - Low Res" and "Book 1 - Hi Res".
I have a couple of copies of Jane Austen books like Pride and Prejudice so I just have multiple entries. I have 1 that is for a copy from here at MobileRead and then I have another book that was from the B&N Classics series freebies.
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