If you put another theme over that one yes, if you go to a back-up you made before you flashed the theme then no.
The best thing to do would be to put on 928's stock theme (the one that keeps you deodexed (there is two)) and then put another theme on top of that. I have read of people who think they get a bad theme because there are parts of the old one left over. Some themes do not have things that the old one did and the old ones are kept in that case.