I don't think so, the 22r exhaust outlet is round while the 22re is oblong, like an ovacado.
edit: oops, didn't see that emissions part. If you're not worried about that then as long as the header flange coveres all the ports then it should be fine right? flow might not be the best.
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)