"rebellion and causing Pharaoh to harden his heart against conviction. Satan hoped also to shake the faith of Moses and Aaron in the divine origin of their mission, that his instruments might prevail. He was unwilling that the children of Israel should be released from bondage to serve the living God. PP 264.3"
"And he hardened Pharaoh’s heart, that he hearkened not unto them; as the Lord had said."
Both passages discuss the hardening of Pharaoh's heart. While Exodus 7:13 attributes it to the Lord, EGW attributes it to Satan's influence, causing Pharaoh to harden his heart. The theme of a hardened heart preventing the Israelites' release is present in both.
"But the prince of evil had a still deeper object in manifesting his wonders through the magicians. He well knew that Moses, in breaking the yoke of bondage from off the children of Israel, prefigured Christ, who was to break the reign of sin over the human family. He knew that when Christ should appear, mighty miracles would be wrought as an evidence to the world that God had sent Him. Satan trembled for his power. By counterfeiting the work of God through Moses, he hoped not only to prevent the deliverance of Israel, but to exert an influence through future ages to destroy faith in the miracles of Christ. Satan is constantly seeking to counterfeit the work of Christ and to establish his own power and claims. He leads men to account for the miracles of Christ by making them appear to be the result of human skill and power. In many minds he thus destroys faith in Christ as the Son of God, and leads them to reject the gracious offers of mercy through the plan of redemption. PP 264.4"
"For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect."
Both passages discuss deception through signs and wonders, although EGW's passage focuses on Satan's counterfeiting of Christ's miracles, while Matthew 24:24 speaks of false Christs and prophets performing deceptive signs. The connection is thematic and meaningful.