ΔE 10.6, fair: the same colour family, but not a straight swap. British Camo Green is more muted, cooler than Military Green. They are different kinds of paint: AMMO by Mig Military Green is an ink, glaze or transparent paint and Army Painter British Camo Green 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 11). British Camo Green is more muted, cooler than Military Green. They are different kinds of paint.
The same difference applies the other way round: Military Green is more saturated, 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 Military Green on the colour wheel See British Camo Green on the colour wheel
All matches: Military Green equivalents · British Camo Green equivalents