ΔE 4.5, very close: most people won’t see a difference side by side. Ink Black Green is a little darker than Militia Green. They are different kinds of paint: Army Painter Militia Green is an opaque base/layer paint and Vallejo Ink Black Green is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 4). Ink Black Green is a little darker than Militia Green. They are different kinds of paint.
The same difference applies the other way round: Militia Green is a little lighter.
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 Militia Green on the colour wheel See Ink Black Green on the colour wheel
All matches: Militia Green equivalents · Ink Black Green equivalents