ΔE 11.7, fair: the same colour family, but not a straight swap. Jade Green is more saturated, cooler than Mid Imperial Khaki. They are different kinds of paint: Army Painter Mid Imperial Khaki is an opaque base/layer paint and Green Stuff World Jade Green is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Jade Green is more saturated, cooler than Mid Imperial Khaki. They are different kinds of paint.
The same difference applies the other way round: Mid Imperial Khaki is 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 Mid Imperial Khaki on the colour wheel See Jade Green on the colour wheel
All matches: Mid Imperial Khaki equivalents · Jade Green equivalents