Wrong! There is only one Gospel and both Peter and Paul taught the same Gospel. Peter and the apostles:
Acts 5:42 UASV+
(42) And every day in the temple and from house to house they kept right on teaching and proclaiming the good news that the Christ was Jesus.
MKJV
(42) And every day in the temple, and from house to house, they did not cease teaching and preaching the gospel: Jesus Christ.
Paul:
1 Corinthians 15:1-11 ISV
(1) Now I'm making known to you, brothers, the gospel that I proclaimed to you, which you accepted, on which you have taken your stand,
(2) and by which you are also being saved if you hold firmly to the message I proclaimed to you—unless, of course, your faith was worthless.
(3) For I passed on to you the most important points that I received: The Messiah died for our sins according to the Scriptures,
(4) he was buried, he was raised on the third day according to the Scriptures—and is still alive!—
(5) and he was seen by Cephas, and then by the Twelve.
(6) After that, he was seen by more than 500 brothers at one time, most of whom are still alive, though some have died.
(7) Next he was seen by James, then by all the apostles,
(8) and finally he was seen by me, as though I were born abnormally late.
(9) For I am the least of the apostles and not even fit to be called an apostle because I persecuted God's church.
(10) But by God's grace I am what I am, and his grace shown to me was not wasted. Instead, I worked harder than all the others—not I, of course, but God's grace that was with me.
(11) So, whether it was I or the others, this is what we preach, and this is what you believed.
Though Paul said that he was "the least of the apostles", he nevertheless claimed that he was one of the apostles, an apostle sent by Jesus just like all the apostles.
Barnes' Notes on verse 11 says:
Therefore, whether it were I or they - I or the other apostles. It is comparatively immaterial by whom it was done. The establishment of the truth is the great matter; and the question by whom it is done is one of secondary importance.
So we preach - So we all preach. We all defend the same great doctrines; we all insist on the fact that the Lord Jesus died and rose; and this doctrine you all have believed. This doctrine is confirmed by all who preach; and this enters into the faith of all who believe. The design of Paul is to affirm that the doctrines which he here refers to were great, undeniable, and fundamental doctrines of Christianity; that they were proclaimed by “all” the ministers of the gospel, and believed by all Christians. They were, therefore, immensely important to all; and they must enter essentially into the hopes of all.
You're just repeating yourself, so I will too! There is only one foundation on which Jesus founded his Church, and he has only founded one Church. We are all brothers in Christ, and have the same hope, the same faith, the same Lord, the same God, and we should all have the same beliefs/doctrine. Ephesians 4:4-6 WEB
(4) There is one body, and one Spirit, even as you also were called in one hope of your calling;
(5) one Lord, one faith, one baptism,
(6) one God and Father of all, who is over all, and through all, and in us all.
Ephesians 4:14 WEB
(14) that we may no longer be children, tossed back and forth and carried about with every wind of doctrine, by the trickery of men, in craftiness, after the wiles of error;
Your doctrine is in error; you have wandered from the Truth. As James wrote, James 5:19-20 WEB
(19) Brothers, if any among you wanders from the truth and someone turns him back,
(20) let him know that he who turns a sinner from the error of his way will save a soul from death and will cover a multitude of sins.
I and others have tried to help you see your error, but it's pointless just repeating ourselves over and over, so I'll stop discussing this now.