ΔE 9.4, close: similar, with a visible difference side by side. UK BSC is a little lighter, more saturated than Terran Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). UK BSC is a little lighter, more saturated than Terran Khaki.
The same difference applies the other way round: Terran Khaki is a little darker, more muted.
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 Terran Khaki on the colour wheel See UK BSC on the colour wheel
All matches: Terran Khaki equivalents · UK BSC equivalents