There are not two Gospels, there were two methods by which the hearts of listeners were pricked, stabbed in their hearts by the same point that Jesus is Whom God had sent for their Salvation. At first, preaching to Jews, Peter's preaching of the kingdom come stirred the belief by which God seals the believer. With the preaching from Paul, God had him go straight to the essence of That Grace of God in Christ, leaving the kingdom frustrated in the dust on the road to Famascus. But the seventieth week of Daniel is yet to arrive, and it will arrive, you may be sure of that because God does not lie.
You must have missed smvoice's comments on two different ways of salvation. The one on Pentecost being one of water baptism and repentance for Jews and then for Gentiles the gospel of Grace.