ΔE 10.6, fair: the same colour family, but not a straight swap. Khaki Shadow is a little darker, more saturated, warmer than Underhive Ash.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Khaki Shadow is a little darker, more saturated, warmer than Underhive Ash.
The same difference applies the other way round: Underhive Ash is a little lighter, more muted, cooler.
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 Underhive Ash on the colour wheel See Khaki Shadow on the colour wheel
All matches: Underhive Ash equivalents · Khaki Shadow equivalents