I think the question is actually about the font size and possible difference margins.
The answer is simply that it change. The scaling used in epubs changed a little bit a few firmware versions ago when there were a lot of changes in how fonts were handled. And I think there was another change somewhere after 4.8 (I don't remember exactly what or when). But, it will mean that you need to select the font size and use that going forward.
For the margins, this also changed somewhere. From memory, epubs could be set so the text was against the bezel (though each device was slightly different). There is some space now when the margin settings are at the leftmost and I have margins set to zero in the book. I have don't remember when that changed, but, it has been this way for a while.
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