You will probably want to post this question in the Immigration Law Q&A (and perhaps Criminal Law) section for more succinct answers. The attorney that helped you get DACA should be able to advise you on this, but I would recommend proceeding carefully, since DACA rights appear to be fairly fragile with regard to being convicted of crimes (like using a false SSN). I am attaching a link to the U.S. Code that is on point with the use of a false SSN. I wish you good luck, but I would recommend proceeding carefully with the assistance of local counsel if you are attempting to assess the risks of getting credit for work previously done under a false SSN.
This answer does not create an attorney client relationship. Claimants should contact local counsel for assistance with their specific cases.