Curtis ran for 1,123 yards on 210 carries in 05' and 1,010 yards on 201 carries in 06'. That's 5.2 YPC. He also had 1,020 yards receiving in those 2 years.
Jamal ran for 775 yards on 166 carries in 12' and 1,233 yards on 217 carries in 13'. That's also 5.2 YPC. Jamal had for 440 yards receiving in those 2 years.
Rushing stats are obviously very similar, though I would say that CB had a much better O-line blocking for him in 2006 than JW has had. CB was a much better receiver out of the backfield, however. Jamal does have 2 more years though. CB didn't really start producing a lot until his junior year. Right now, I would say they are very similar.