Everything is basically merged, but the 'remove paragraph spacing' and 'font size rescaling' are both things that will usually 'win' over the extra_css options that conflict. Disable both of those and you should be ok for the vast majority of cases, though depending on the original book formatting you may want font size rescaling enabled. It usually does just fine, but if there are drop-caps/raised-caps the font size rescaling could shift those around.
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