Yes.
BUT some of the OCRing is better than others.
Some stuff has everything nicely OCR'd. In other products, parts of text pages - or even entire pages - are considered "graphics" and not OCR'd.
It's hit and miss - and as usual with OCR, there's a ton of "crap" that gets through too.
If you're asking, "can I cut and paste with no editing" the answer is no. If you're asking "can I cut and paste and with about two minutes of editing per page get everything nice and neat" the answer is, "for the most part, yes."
--The Sigil