ΔE 10.9, fair: the same colour family, but not a straight swap. Mid Imperial Khaki is a little darker, more muted, warmer than Green Sky.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Mid Imperial Khaki is a little darker, more muted, warmer than Green Sky.
The same difference applies the other way round: Green Sky is a little lighter, more saturated, 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 Green Sky on the colour wheel See Mid Imperial Khaki on the colour wheel
All matches: Green Sky equivalents · Mid Imperial Khaki equivalents