ΔE 12.8, fair: the same colour family, but not a straight swap. Hemp BS4800/10B21 is a little darker, cooler than Mid Imperial Khaki.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Hemp BS4800/10B21 is a little darker, cooler than Mid Imperial Khaki.
The same difference applies the other way round: Mid Imperial Khaki 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 Mid Imperial Khaki on the colour wheel See Hemp BS4800/10B21 on the colour wheel
All matches: Mid Imperial Khaki equivalents · Hemp BS4800/10B21 equivalents