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