The diff and transmission in the 2018 are the same as the 2017. Also the type of fluid you need can be found in the Specification section of the owner's manual (600+ pages) which you can download from Honda's website.
https://owners.honda.com
Diff is Dual Pump Fluid II AKA DPSF-II
Trans is HCF-2
https://owners.honda.com
Diff is Dual Pump Fluid II AKA DPSF-II
Trans is HCF-2