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No, it isn't. Conversion always flattens CSS. I'm not sure why you are using the workflow you describe. A better one would be to save as docx in libreoffice, then use the calibre editor to import the DOCX which will generate an EPUB that you can edit to your hearts content (the style names will be better than with a conversion, but still not identical to the input document). After perfecting the EPUB, upload that to KDP
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