ΔE 3.9, very close: most people won’t see a difference side by side. Noble Skin is cooler than Khaki green No.3. They are different kinds of paint: AK Interactive Khaki green No.3 is an opaque base/layer paint and Army Painter Noble Skin is a one-coat contrast-style 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). Noble Skin is cooler than Khaki green No.3. They are different kinds of paint.
The same difference applies the other way round: Khaki green No.3 is 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 Khaki green No.3 on the colour wheel See Noble Skin on the colour wheel
All matches: Khaki green No.3 equivalents · Noble Skin equivalents