It's the same as the "new" choice xtra but it includes several channels that were removed like "Boomerang" and a few others. The Choice Extra Classic package also costs a dollar more than the "new" package (go figure).
Initially, these were the channels that were in Choice Xtra Classic, but not in the current Choice Xtra:
CBS Sports Channel
Things may have changed since then, but I have Choice Xtra Classic and have all these channels currently.