Oh, wow, I just figured it out... and it was easy!
I really don't wanna seem like i'm advertising, but since it's a free program and all..... I found this program called Allway Sync, and if you hook up both of your Kindles to your computer and run the program it updates everything, most importantly, the mbp files!
You can have everything sync or just files that you choose. I don't know what this would do to Amazon-purchased ebooks, I only tested this with files and books I got from other sources.
If you have more than one Kindle (like me, I Have a DX for school and the K3 for pleasure reading) with a lot of books and documents from non-amazon sources, I would check out Allway Sync!
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