Dave,

Using grep misses the parts where the default font defined in the style file is used. What it traps are only the parts where a a manual setting of the font was applied, and there you see only one font. In practice there could be many more, non of them detected by grap for the same reason that they are defined only in the style file and are used according to the cell style and the environment used for the notebook I do not have the Utopia font on my system (MAC OS X) the font Utopia is converted to something else - font "Times" ... best yehuda

When opened in the newest version 11.1.1, you see that the two text are, actually, typeset in different fonts:

One is clearly sans-serif, and one if serif. (arial, and times from the looks of it, i'm not sure...) They might look the same on your system if you miss certain fonts or if they are not found...

If you select all the text and convert it to a single font, and then re-export, does that work?