"Chapter 41—“Almost Thou Persuadest Me” This chapter is based on 25:13-27 ; 26 . Paul had appealed to Caesar, and Festus could not do otherwise than send him to Rome. But some time passed before a suitable ship could be found; and as other prisoners were to be sent with Paul, the consideration of their cases also occasioned delay. This gave Paul opportunity to present the reasons of his faith before the principal men of Caesarea, and also before King Agrippa II, the last of the Herods. AA 433"
"And after certain days king Agrippa and Bernice came unto Cesarea to salute Festus."
The EGW passage explicitly states that the chapter is based on Acts 25:13-27 and 26, directly referencing the arrival of Agrippa and Bernice.
"“After certain days King Agrippa and Bernice came unto Caesarea to salute Festus. And when they had been there many days, Festus declared Paul's cause unto the king, saying, There is a certain man left in bonds by Felix: about whom, when I was at Jerusalem, the chief priests and the elders of the Jews informed me, desiring to have judgment against him.” He outlined the circumstances that led to the prisoner's appeal to Caesar, telling of Paul's recent trial before him, and saying that the Jews had brought against Paul no accusation such as he had supposed they would bring, but “certain questions ... of their own superstition, and of one Jesus, which was dead, whom Paul affirmed to be alive.” AA 433.2"
"And when they had been there many days, Festus declared Paul’s cause unto the king, saying, There is a certain man left in bonds by Felix:"
EGW is directly quoting Acts 25:14.