Yes. You have a Kindle 3, so if you pick the "Transfer via Computer" option when you get the sample, then if it downloads to your computer with a .tpz file extension instead of .azw, it's Topaz. Also, the font in a Topaz book will look non-standard.
If you get your samples wirelessly, then the Topaz extension is .azw1. Don't send it to any Kindle for PC/Mac install you've got; they both get all their books as either .prc or .azw file extensions, regardless of the format.
Also you might want to check to see if there's a table of contents, and the number of locations.
Samples are supposed to give 10% of the actual file, so if it's got the same # locations regardless of file size, it probably means that somehow the bigger book got bloated up during the formatting/conversion process (poor use of Microsoft Word's HTML export function can do this).
But sometimes books may be bundled or omnibus editions, but the title/cover image used on the product page doesn't describe this. I've read that one of the Kindle editions of Anne McCaffrey's Dragonflight is actually a bundle of Dragonflight and its sequel Dragonquest. So if the TOC lists chapters for two books or more, then that may account for the difference instead.
Best of luck with it.
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