ΔE 10.7, fair: the same colour family, but not a straight swap. Khaki is a little darker, cooler than Karak Stone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Khaki is a little darker, cooler than Karak Stone.
The same difference applies the other way round: Karak Stone is a little lighter, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Karak Stone on the colour wheel See Khaki on the colour wheel
All matches: Karak Stone equivalents · Khaki equivalents