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I don't think you can do what you want. Information about ebooks is kept in binary database files on the device. You can't really copy a database file from one device to another. What you need is to update your HD3's database with the correct information as you load the ebooks. Maybe calibre would help make that easier. Otherwise, you'll need to just add the new ebooks, and group them by hand into collections via the Library tab (yes, it would be a pain if you are adding a lot of ebooks), or use the app provided at the start of this thread.
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