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The opened date of an OC account is a factual date that should be consistent, regardless of the CRA to which the creditor reported.
Thus, yes, it is a disputable inaccuracy.
However, it is only a 2 week difference, so will have minimal effect on your scoring of length of credit.
A dispute will not require any deletion of the reported account, as deletion only applies to the specific item of information that is subject of the dispute, and an account must have a reported open date. Thus, resolution of the dispute will simply result in correction of whichever CRA information is determined to be inaccurate.
I would question the value of any such dispute based on the minimal difference in dates.
Some of the CRA's use the first of the month that the card was opened and others use the actual date during the month. This has gone on forever. It's not likely a winable argument, but you have nothing to lose by trying.