I believe that you mean the most current revision when you say 3rd edition. I scanned the core book combat tables from the earlier and current versions. It looks like they are the same, so the Hack and Slash should be ok to use. I can't speak to the Harpers Bazaar as I have not seen it. As for the Codex, it is not compatible with the current version. According to the foreward in the current version, all spells have had their base and scaling option costs recalculated according to the rules in the current version of College of Magics.
