Matthew 7:2 (King James Bible) for with what judgment ye judge ye shall be judged and with what measure ye mete it shall be measured to you again
Here the 1888 LDS edition twice replaced what with that, giving “for with that judgment ye judge… and with that measure ye mete”. This change may have been intentional since it was made twice. This change was never transmitted into any subsequent LDS edition, not only because it was an awkward reading (and contrary to the King James reading), but also because the 1888 edition never served as a copytext. The critical text will, of course, retain the original what in both instances.
Summary: Maintain both instances of what in “for with what judgment ye judge … and with what measure ye mete”, the earliest reading in 3 Nephi 14:2 as well as the corresponding reading in Matthew 7:2.