"Chapter 42—True Greatness This chapter is based on Daniel 4 . Exalted to the pinnacle of worldly honor, and acknowledged even by Inspiration as “a king of kings” ( Ezekiel 26:7 ). Nebuchadnezzar nevertheless at times had ascribed to the favor of Jehovah the glory of his kingdom and the splendor of his reign. Such had been the case after his dream of the great image. His mind had been profoundly influenced by this vision and by the thought that the Babylonian Empire, universal though it was, was finally to fall, and other kingdoms were to bear sway, until at last all earthly powers were to be superseded by a kingdom set up by the God of heaven, which kingdom was never to be destroyed. PK 514"
"For thus saith the Lord God; Behold, I will bring upon Tyrus Nebuchadrezzar king of Babylon, a king of kings, from the north, with horses, and with chariots, and with horsemen, and companies, and much people."
The EGW passage explicitly references Ezekiel 26:7 and its description of Nebuchadnezzar as "a king of kings."
"Nebuchadnezzar's noble conception of God's purpose concerning the nations was lost sight of later in his experience; yet when his proud spirit was humbled before the multitude on the plain of Dura, he once more had acknowledged that God's kingdom is “an everlasting kingdom, and His dominion is from generation to generation.” An idolater by birth and training, and at the head of an idolatrous people, he had nevertheless an innate sense of justice and right, and God was able to use him as an instrument for the punishment of the rebellious and for the fulfillment of the divine purpose. “The terrible of the nations” ( Ezekiel 28:7 ), it was given Nebuchadnezzar, after years of patient and wearing labor, to conquer Tyre; Egypt also fell a prey to his victorious armies; and as he added nation after nation to the Babylonian realm, he added more and more to his fame as the greatest ruler of the age. PK 514.2"
"Behold, therefore I will bring strangers upon thee, the terrible of the nations: and they shall draw their swords against the beauty of thy wisdom, and they shall defile thy brightness."
Ellen White directly references Ezekiel 28:7 in this passage.
"How great are his signs! and how mighty are his wonders! his kingdom is an everlasting kingdom, and his dominion is from generation to generation."
The EGW passage directly quotes Daniel 4:3 regarding God's everlasting kingdom and dominion, making it a clear explicit allusion.
"O Assyrian, the rod of mine anger, and the staff in their hand is mine indignation."
Both passages refer to God using a powerful, even oppressive, nation (Assyria/Babylon) as an instrument of His will. However, the connection is somewhat loose, as the EGW passage focuses on Nebuchadnezzar's role and the Isaiah verse is a more general statement about Assyria. The connection is thematic, but not a direct allusion.