Personally I'd just start over with a jar file named cq-publish-p4503.jar. If you haven't started up your the author instance yet and just have it as it was unpacked it would probably work (although I have never tried it). Once you start up the author instance however I wouldn't use that as a starting point - the initial start up process will potentially load an number of author specific configurations which you don't want on a publish instance.
Safest thing to do though is start over.