Most AZW3/KF8 eBooks start off life as an ePub eBook. That is then run through Kindlegen to create the KF8/Mobi versions. So really overall, there is no difference at all between KF8 & Mobi given that most start life as ePub.
Now, the best way to convert KF8 to ePub is to use Calibre with the KindleUnpack plugin. It will allow you to shift the files from KF8 into an ePub container. Then you check the ePub with epubcheck 3.x and then use Sigil to fix the errors. Fonts can be sorted out with Sigil if there are any embedded fonts.
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