The Gentiles knew the Jews did not associate with them and that they were unclean!
There isn't a different message!
The Gentiles were dead in their sins because they did not clean themselves with the ceremonial works...they were dead in their sins and the UN circumcision of their flesh.
Colossians 2:13 When you were dead in your sins and in the uncircumcision of your flesh, God made you alive with Christ. He forgave us all our sins,
Paul is explaining to GENTILES that Jesus saved them and did not make them get circumcised before he saved them.
They (gentiles) NEVER were under any law of God to begin with.