What two sections of the Doctrine and Covenants are identical except for one word?

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Sections 15 and 16

These two six-verse sections are exactly the same, except for the fourth word in the first verse.

Hearken, my servant John and listen to the words of Jesus, Christ, your Lord and your Redeemer.... 15:1

Hearken, my servant Peter, and listen to the words of Jesus Christ, your Lord and your Redeemer. 16:1

It was sort of a form revelation for Joseph Smith's benefactors in the Whitmer family.