As both the earlier administrative proceeding and the earlier Article III proceeding permitted joinder of the EEOC claim to the civil suit, Title VII claim rooted in the same nucleus of facts is barred under res judicata.
https://www.cadc.uscourts.gov/internet/opinions.nsf/A7A90C4B0D21BC8A852582BB0050FB8F/$file/17-5136.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.