Perhaps that is because there is only one Gospel. At first communicated in shadows and types the later plainly through the atoning work of Jesus Christ.
I am astonished that you are so quickly deserting him who called you in the grace of Christ and are turning to a different gospel— not that there is another one, but there are some who trouble you and want to distort the gospel of Christ. But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed.
(Gal 1:6-8)
And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up,
(Joh 3:14)
And taking the twelve, he said to them, “See, we are going up to Jerusalem, and everything that is written about the Son of Man by the prophets will be accomplished. For he will be delivered over to the Gentiles and will be mocked and shamefully treated and spit upon. And after flogging him, they will kill him, and on the third day he will rise.”
(Luk 18:31-33)
Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.
(Heb 1:1-2)