Topaz is literally scans of the original pages of the original paper book. The scans then go through proprietary Amazon publishing software to convert the individual characters/images to a library of custom glyphs. The cool thing about Topaz is it's the only pdf-like format that supports reflow really well. But unless you're Amazon there is no way to create one.
Hence there is no way to go from a proper ebook format to a Topaz book...
Regarding different variants of the book, it's possible that it might be Topaz in one marketplace and mobi in another - a Topaz version is sometimes released first to get a book to market quickly, and then followed up with a proper mobi version. I imagine it's also possible in those cases they wouldn't update the sample...
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