Did Peter's message in Acts 5 change the message Zacharias delivered?
No, Peter's message did not change Zacharias's message; nothing changed between Zacharias's statement and Acts 5. Peter was practically saying the same thing Zacharias did—that Christ had come to give Israel remission of sins and also to be their King.
Les explains that between Zacharias's message and Acts 5, nothing has changed. Zacharias, speaking by inspiration of the Holy Spirit, declared the covenant sworn to Abraham: deliverance from physical enemies, salvation for the nation of Israel, and the forgiveness of sin. In Acts 5, Peter is practically saying the same thing Zacharias did—that Christ had come to give them remission of sins, but also to be their King. So Peter's message did not replace or alter Zacharias's message; it continued the same covenant-based promise to Israel.