They aren't the same. Apple have got a bit sloppy with TM recently.
I run several Mac labs and studios in a university. Up until a few weeks ago, we used TM to back up 50 macs to a central xServe (sparse bundles). Lots of data - film and audio stuff. TM gradually became more and more flakey with various updates, until it broke completely a few weeks back. We just couldn't get it working again, and didn't have the time to go through endless work rounds. We are now trialling CCC, and it seems much better.
For network backups, I would say CCC wins hands down in terms of stability.
Also, TM tends to slow Macs down quite drastically, especially when working on audio/video, so we had to use 3rd party software to schedule them to night time, as TM does not have this feature built it. CCC does.
All in all, I would say CCC is much better for enterprise level network backups, if that's your thing.
//edit
Sorry - forgot to add, CCC gives you much more flexibility over archiving/pruning files etc. TM doesn't give you as much and therefore takes up more disk space.