Acts 23:6
But perceiving that one group were Sadducees and the other Pharisees, Paul began crying out in the Council, “Brethren, I am a Pharisee, a son of Pharisees; I am on trial for the hope and resurrection of the dead!”
Notice that Paul used the present tense, not past tense: I am a Pharisee. OK let us go a bit later, with Paul arriving in Rome:
Acts 28:17
After three days Paul called together those who were the leading men of the Jews, and when they came together, he began saying to them, “Brethren, though I had done nothing against our people or the customs of our fathers, yet I was delivered as a prisoner from Jerusalem into the hands of the Romans.
"Customs of the fathers" refers to the oral tradition, later to be written down in the Mishnah and Talmuds. That was the tradtion of the Pharisees. So Paul is still claiming to be faithful to his Pharisaic upbringing.
Right, but my point was ‘whether he called himself a Pharisee or others did, his teaching was 180deg different than the Pharisees calling their attempt at righteousness before God as ‘dung’ v.8’.
Philippians 3:5-10 KJV
[5] Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee; [6] Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless. [7] But what things were gain to me, those I counted loss for Christ. [8] Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ, [9] And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: [10] That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death;
Also through the new birth he sees…
2 Corinthians 5:17 KJV
[17] Therefore if any man be in Christ,
he is a new creature: old things are passed away; behold, all things are become new.
Ephesians 2:15 KJV
[15] Having abolished in his flesh the enmity, even the law of commandments contained in ordinances;
for to make in himself of twain one new man, so making peace;
and unlike Pharisees, Paul saw himself dead to the law…
Romans 7:4 KJV
[4] Wherefore, my brethren,
ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
Galatians 2:19-20 KJV
[19]
For I through the law am dead to the law, that I might live unto God. [20] I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
So people can name Paul a pharisee all they want, but in his new nature he was anything but one.