It's unfortunate the question limits itself to 1Peter,1 Peter because 2Peter2 Peter 3:15-16 makes clear that Kefa (Peter) was familiar with Shaul's (Paul's) writing.
1515 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, 1616 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.