It's supposed to be a one-time deal with a good number of airlines and hotel programs, but it doesn't always turn out that way, nor do I know if CO's policy is "once in account lifetime" or not. In any event, what's the worst that can happen from trying even if you had gotten a status match before? You won't get it if you don't ask, and if you ask and get denied you're not out more than some time and the cost of a fax.