No, he said:
Therefore, beloved, looking forward to these things, be diligent to be found by Him in peace, without spot and blameless; and consider that the longsuffering of our Lord is salvation—as also our beloved brother Paul, according to the wisdom given to him, has written to you, as also in all his epistles, speaking in them of these things, in which are some things hard to understand, which untaught and unstable people twist to their own destruction, as they do also the rest of the Scriptures. - 2 Peter 3:14-16
http://www.biblegateway.com/passage/?search=2Peter3:14-16&version=NKJV
Peter says two things here, they are 1) that some of the things Paul wrote in his epistles are hard to understand, and 2) that those who are untaught and unstable twist those things (and the rest of scripture) to their own destruction.
1. Some of the things Paul wrote are hard to understand.
If Peter and Paul were teaching the same message (note, not a different Gospel, but a different message), and if both of them were well educated in what they were teaching, why would Peter say that what Paul was saying is hard to understand? Again, if it were the same message, then would it not be easy for them both to understand?
2. Those who are untaught and unstable twist scripture to their own destruction.
This is why it is important to:
Be diligent to present yourself approved to God, a worker who does not need to be ashamed, rightly dividing the word of truth. - 2 Timothy 2:15
http://www.biblegateway.com/passage/?search=2Timothy2:15&version=NKJV
For if you do not rightly divide God's word, GT, you end up saying what you say. You are untaught and unstable, and you twist Scripture to your own destruction.
Therefore:
Be diligent to present yourself approved to God, a worker who does not need to be ashamed, rightly dividing the word of truth.
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Also, Peter, after saying this to the people he is speaking to (the Jews, in case you need reminding) DOES NOT SAY to obey. He says:
You therefore, beloved, since you know this beforehand, beware lest you also fall from your own steadfastness, being led away with the error of the wicked; but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory both now and forever. Amen. - 2 Peter 3:17-18
http://www.biblegateway.com/passage/?search=2Peter3:17-18&version=NKJV
No mention of obedience. In fact, not once in the entire book of 2 Peter does Peter say to obey.
In short, you're the one who has misunderstood Paul, and twist what he says and the rest of scriptures to your own destruction.