The 1892 RLDS edition accidentally replaced partaking with partakers. Although such a use is found elsewhere (“that ye also may be partakers of the fruit of the tree of life” in Alma 5:62), partaking is the correct form here in verse 27, especially in light of its use a few verses later:
For this second passage, the 1892 RLDS edition did not replace partaking with partakers, so it appears that the 1892 change in verse 27 is a typo.
Summary: Maintain partaking in 1 Nephi 8:27, especially given its parallel use in verse 33.