I've taken a look at this with my Aura HD (firmware 3.2.0) using "The Widow Lerouge" and here's what I note:
- For my margin/font settings, which were made to make KePub files look good (at least, what I think looks good), the ePub version looks really bad. No margins at all and the text issquashed too close together.
- The font size appears to be the same as what I've been using for the KePub reader. It may be slightly different, but it's not different enough that my 30/20 uncorrected vision can tell the difference.
- The book does not start at the cover page or show the book's front matter; rather, it starts directly at the first page of Chapter One.
- Switching to the KePub version, the text looks "normal" based on my KePub reader settings. Again, I can't tell any difference in the font.
- Repeating with Document Default gives me the same results.
The ePub file was downloaded and directly saved to the Kobo reader. The KePub file was generated by adding the book to calibre and sending to the reader with the following driver settings (relating to editing files within the book) activated:
- Hyphenate files
- Clean up ePub markup
- Replace Content Language Code
- Smarten Punctuation