"Princes and rabbis, soldiers, publicans, and peasants came to hear the prophet. For a time the solemn warning from God alarmed them. Many were brought to repentance, and received baptism. Persons of all ranks submitted to the requirement of the Baptist, in order to participate in the kingdom he announced. DA 105.1"
"Then went out to him Jerusalem, and all Judea, and all the region round about Jordan,"
Both passages describe large numbers of people coming to hear John the Baptist. Matthew 3:5 mentions Jerusalem, Judea, and the region around Jordan, while EGW mentions various social classes. The core idea of a large audience is shared.
"Many of the scribes and Pharisees came confessing their sins, and asking for baptism. They had exalted themselves as better than other men, and had led the people to entertain a high opinion of their piety; now the guilty secrets of their lives were unveiled. But John was impressed by the Holy Spirit that many of these men had no real conviction of sin. They were timeservers. As friends of the prophet, they hoped to find favor with the coming Prince. And by receiving baptism at the hands of this popular young teacher, they thought to strengthen their influence with the people. DA 105.2"
"But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?"
The EGW passage directly references the Pharisees and their motives for seeking baptism, expanding on the brief account in Matthew 3:7. It provides additional context and interpretation of their actions.