There is not penalty for being mistaken or wrong--the law accepts that people make mistakes and does not criminalize good-faith errors. Deliberately filing a false report or making a false accusation can lead to  criminal charges against you, but based on what you describe, that is not what happened. However, once you know of the mistake, you need to let the authorities know; failure to do would be effectively knowingly maintain the lie, and that continuing to persist in an incorrect identification can constitute deliberately making a false report.