One thing is CERTAIN. Whoever the two witnesses are, they are literally witnesses and literally two people. Just as John the Baptist was a real man. Another CERTAINTY is they will proclaim the same Faithful and True message the apostles delivered-—The Gospel of Jesus Christ crucified, died, buried and three days later rose from the dead.
If they don’t preach the shed Blood of Jesus Christ “cleanseth us from all sin” and the Resurrection, then such “witnesses” are false.