ΔE 12.7, fair: the same colour family, but not a straight swap. Komodo Khaki is a little lighter, more saturated, cooler than Agrellan Earth. They are different kinds of paint: Citadel Agrellan Earth is a technical paint or medium and Green Stuff World Komodo 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 13). Komodo Khaki is a little lighter, more saturated, cooler than Agrellan Earth. They are different kinds of paint.
The same difference applies the other way round: Agrellan Earth is a little darker, more muted, 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 Agrellan Earth on the colour wheel See Komodo Khaki on the colour wheel
All matches: Agrellan Earth equivalents · Komodo Khaki equivalents