There is a difference in the preaching of Peter and Paul in regards to the resurrection and salvation.
The resurrection:
The twelve preached Jesus raised from the dead to sit upon the throne of David (Acts 2:30).
Paul preached that Jesus was raised for our justification unto eternal life (Romans 4:25).
Salvation:
The twelve preached the forgiveness of sin and salvation for the believing nation of Israel at the coming of Christ (Acts 3:19 1 Peter 1:5 1 Peter 1:7).
Paul preached salvation now by faith in the shed blood of Christ (Ephesians 2:8).
The resurrection:
The twelve preached Jesus raised from the dead to sit upon the throne of David (Acts 2:30).
Paul preached that Jesus was raised for our justification unto eternal life (Romans 4:25).
Salvation:
The twelve preached the forgiveness of sin and salvation for the believing nation of Israel at the coming of Christ (Acts 3:19 1 Peter 1:5 1 Peter 1:7).
Paul preached salvation now by faith in the shed blood of Christ (Ephesians 2:8).