31¶Then he took unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished.Everything mentioned in Matthew, Mark, Luke and John are still the same gospel that they always were.
2Cor 11:4; For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted—you may well put up with it!
Gal 1:6; I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel,
Paul didn't preach a "different" gospel than Jesus. But even even he would have, Paul isn't your Savior, your Lord or your God.
32For he shall be delivered unto the Gentiles, and shall be mocked, and spitefully entreated, and spitted on:
33And they shall scourge him, and put him to death: and the third day he shall rise again.
34¶And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken.
Notice after they have been preaching the ' Gospel ' for a while now they do not know the Gospel we preach today. Verse 34 says clearly they did not understand it at all .