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An epub file is really just a zip archive containing primarily an HTML and CSS file for the text, jpg files for the images, plus a few control files (metadata, etc). If you want to see this without using a tool like Sigil, just rename an epub to extension .zip and look at it.
Therefore, if you have the HTML for the Kindle file, it should certainly be usable for the Nook. Having said all that as background, I agree with kevinp that you should first try using Calibre and doing a mobi to epub conversion.
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