ΔE 11.6, fair: the same colour family, but not a straight swap. Mid Mustard Khaki is a little darker, more muted, warmer than Light Olive Green. They are different kinds of paint: AMMO by Mig Light Olive Green is an ink, glaze or transparent paint and Army Painter Mid Mustard Khaki is an opaque base/layer 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). Mid Mustard Khaki is a little darker, more muted, warmer than Light Olive Green. They are different kinds of paint.
The same difference applies the other way round: Light Olive Green 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 Light Olive Green on the colour wheel See Mid Mustard Khaki on the colour wheel
All matches: Light Olive Green equivalents · Mid Mustard Khaki equivalents