Nephi saw everything in vision that John the Revelator saw but was commanded not to write what John would write. Nephi used the term "lamb" when referring to Jesus Christ more than any other Book of Mormon writer (see the commentary on 1 Nephi 10:10). John used the term "Lamb" more than any other New Testament writer (twenty-eight times in the Book of Revelation). Their unique use of this word suggests that they were given the same vision. [Zarahemla Research Foundation, Study Book of Mormon, p. 30]
Note* For the benefit of the reader, the term "lamb (of God)" has been highlighted in the text of The Covenant Story for the chapters which deal with Nephi's Vision (1 Nephi 11-14). In just these few chapters the term "the Lamb (of God)" not only appears over fifty times, but is connected with Christ and defined in a multitude of ways. [Alan C. Miner, Personal Notes]