ΔE 11.0, fair: the same colour family, but not a straight swap. Cobalt Green is a little darker, more muted, warmer than Coelia Greenshade. They are different kinds of paint: Citadel Coelia Greenshade is a wash/shade and Golden Cobalt 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). Cobalt Green is a little darker, more muted, warmer than Coelia Greenshade. They are different kinds of paint.
The same difference applies the other way round: Coelia Greenshade is a little lighter, more saturated, cooler.
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 Coelia Greenshade on the colour wheel See Cobalt Green on the colour wheel
All matches: Coelia Greenshade equivalents · Cobalt Green equivalents