*Minor differences ignored. Grouped by changes, with first version listed as example.
The children of Korah died not - Compare Numbers 26:58. Samuel the prophet was of this family, and Heman, "the king's seer" 1-Chronicles 6:22, 1-Chronicles 6:33; 1-Chronicles 25:5. Several of the Psalm appear from the titles to have been composed for the sons of Korah: compare titles of Psalm 42:1-11; 44; 45, etc.
The children of Korah died not - It is difficult to reconcile this place with Numbers 16:27, Numbers 16:31-33, where it seems to be intimated that not only the men, but the wives, and the sons, and the little ones of Korah, Dathan, and Abiram, were swallowed up by the earthquake; see especially Numbers 16:27, collated with Numbers 16:33. But the text here expressly says, The children of Korah died not; and on a close inspection of Numbers 16:27, we shall find that the sons and the little ones of Dathan and Abiram alone are mentioned. So they gat up from the tabernacle of Korah, Dathan, and Abiram, on every side: and Dathan and Abiram came out - and their wives, and their sons, and their little ones. Here is no mention of the children of Korah, they therefore escaped, while it appears those of Dathan and Abiram perished with their fathers. See the note on Numbers 16:30.
Notwithstanding, the children of Korah died not. Neither of the pestilence, nor by fire, nor by the swallowing up of the earth; they not being in the counsel of their father, but followed the doctrine of Moses the prophet, as the Targum of Jonathan; they either disliked their father's scheme, or, if they engaged with him in it, they repented and departed from him, and were not present when the judgments of God came upon him and his company; there were several of his posterity who were singers in the times of David, and to whom many of the psalms were sent to be sung.
Notwithstanding the children of Korah died not--Either they were not parties to their father's crime, or they withdrew from it by timely repentance. His descendants became famous in the time of David, and are often mentioned in the Psalm [Psalm 42:1; Psalm 44:1; Psalm 45:1; Psalm 46:1; Psalm 47:1; Psalm 48:1; Psalm 49:1; Psalm 84:1; Psalm 85:1; Psalm 87:1; Psalm 88:1], also in 1-Chronicles 6:22, 1-Chronicles 6:38.
Died not - God being pleased to spare them, because they disowned their father's fact, and separated themselves both from his tent and company. Hence the sons of Korah are mentioned, 1-Chronicles 6:22, 1-Chronicles 6:38, and often in the book of Psalm.
*More commentary available at chapter level.