I have only use a Calibre epub-to-epub conversion a few times, but it did seem as though it left my *named* classes pretty much alone, except for creating a few "name1", 'name2" variants.
What Calibre *did* do was create new named styles for any of my "generic" classes, i.e.,
p {text-indent: 1.2em;}.
If I had named that class to .indent, the name and attributes were not altered.
I haven't done enough of these to be able to say it works that way all the time.
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