I cannot imagine how Peter felt after denying Jesus three times, but he was forgiven and allowed to bring the Gospel and his own testimony of forgiveness because of his momentary lack of faith. Would the world have been better off if he had not denied the Christ? It would seem God could still use Him for His glory.
Not knowing these two men's relationship with God, it's difficult to say what their very public and obviously forced conversion means in the grand scheme of things. Perhaps it's best left to the judgment of the One Who knows their hearts and how the rest of their time on Earth can be used for Him.
Why would you even bother posting that you don't know and can't know?
We do know that we aren't supposed to deny Christ, don't we?