Are the Ananias of Acts 5 the same as Acts 9 and Acts 23 all the same person?

No. Acts contains references to three different men named Ananias:

1) The husband of Sapphira, who was struck dead in Acts 5:5.

2) A disciple (Christian) who lived in Damascus and had an active role in the conversion of Saul of Tarsus (Acts 9 and 22)

3) The high priest in Jerusalem; a member of the council before which Paul appeared in his own defense (Acts 23 and 24).