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I've downloaded both sample of the first example files. They are both Mobipocket format Kindle files. The larger one seems to contain jpeg files (& a much better resolution cover image) than the smaller one.
Unpacking the files, the HTML is different too, seemingly separate conversions from the same source files. The larger one seems to be slightly more recent — the ISBN number is given as an ISBN-13 as well as an ISBN-10 (the two ISBN-10s are identical). The coding is slightly more compact too (the larger size comes from the images, not the text).
Rather weird that the older one is still for sale.
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