ΔE 11.7, fair: the same colour family, but not a straight swap. Chromium Oxide Green Dark is a little lighter, cooler than Military Shade. They are different kinds of paint: Army Painter Military Shade is a wash/shade and Golden Chromium Oxide Green Dark 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). Chromium Oxide Green Dark is a little lighter, cooler than Military Shade. They are different kinds of paint.
The same difference applies the other way round: Military Shade is a little darker, 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 Shade on the colour wheel See Chromium Oxide Green Dark on the colour wheel
All matches: Military Shade equivalents · Chromium Oxide Green Dark equivalents