Is it luck that Joseph’s Smith account of Enoch ends on a note of hope?

In Moses 6:52, Enoch offers hope to the people:

And he also said unto him: If thou wilt turn unto me, and hearken unto my voice, and believe, and repent of all thy transgressions, and be baptized, even in water, in the name of mine Only Begotten Son, who is full of grace and truth, which is Jesus Christ, the only name which shall be given under heaven, whereby salvation shall come unto the children of men, ye shall receive the gift of the Holy Ghost, asking all things in his name, and whatsoever ye shall ask, it shall be given you.

Jeffrey M. Bradshaw remarks:

In the Book of Giants, Enoch also gives hope to the wicked through repentance: “Now, then, unfasten your chains [of sin]… and pray.” In addition, Reeves conjectures that another difficult-to-reconstruct phrase in the Book of Giants might also be understood as an “allusion to a probationary period for the repentance of the Giants.
– Jeffrey M. Bradshaw – KnoWhy OTL05C — Could Joseph Smith Have Drawn On Ancient Manuscripts When He Translated the Story of Enoch?

Why are there such similarities between the Book of Moses and accounts of Enoch (discovered much later)?

See:

Jeffrey M. Bradshaw – KnoWhy OTL05C — Could Joseph Smith Have Drawn On Ancient Manuscripts When He Translated the Story of Enoch?

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