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You cam right click on any file in the book browser to save as and then add an additional file to the other epub. You can copy text from one to the other, using the clipboard. Lots of us have .css files on our hard drives and add them to epubs we are creating, so we are sure we have the items we want, named as we are familiar with them. Stylesheets from a given program are likely to be much the same, so if they are from the same program, likely the references in the work would be ok if you combined two of them.
I think though you want them to be magically integrated. There isn't any way to do that since it would require a lot of guessing by the program, as to which stylesheet to use, where does text go, etc.
Save copies with different names and have it and see what happens. So long as you are only working with copies you are merely wasting a little time if it doesn't work.
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