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part001.html is likely from an azw3-to-epub conversion. CR!{long_long_string_of_random_letters}_split_000. html is almost definitely from a MOBI-to-EPUB conversion.
This is just based on how the two formats internally identify sections in the book. It shouldn't make any difference, however if you like, you can rename the files. Sigil can bulk rename files to match a numbering sequence.
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