Please check the description
My other gigs for MOBI and ePub are manual conversions using HTML tags and you will get either a MOBI file or an ePub file as the finished product. In this gig you will have get a word files instead, the relevant ebook platform will convert the word book to MOBI or ePub.
Because you will be getting a word file in this gig you can make minor changes yourself but there are disadvantages like we don't have full control over the looks and certain functionality when compared to the professional look and the clean code inside that enhances the ePub and Mobi.
Even though both platforms accept word files, they use different methods when converting it. For example the table of contents created for Amazon is not accepted by Smashwords and a TOC created for Smashwords won't be converted properly to NCX by Amazon KDP.