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For most such books I use two Calibre records as well. However, just for a few of them (where I wouldn't usually browse through the older editions but still don't feel like deleting) I added the older editions packed as .rar archives.
You have to be careful about it, though. If I remember correctly, Calibre will recognize e.g. a .pdf in a .rar or .zip file and overwrite your other file of this format (because, as itimpi has already mentioned, only a single instance of a given format is allowed). To prevent it, you need more files in the archive (preferably of different formats, e.g. an additional empty .txt file). Before you try this, copy all your files to a location outside of Calibre, just in case.
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