If you want to use them in CC3, I'd suggest that you download the Dundjinni (TM) version. The graphics there are best suited for CC3 conversions.
However, I haven't used CC3 for a good year and a half, so I don't remember anymore what you have to run in CC3 to convert them into files with the proper CC3 scaling. On the CC3 mailing list in May or June 2008, I believe, Ralf Schemmenn of ProFantasy posted a message telling how to do that. You could search the CC3 mailing list archives for that information, or you simply could E-Mail Ralf and ask him. He's available at:
He's also a member here under the user name Uthoroc.
The Vintyri (TM) Project