ΔE 8.9, close: similar, with a visible difference side by side. Boreal Green is a little darker, cooler than Coelia Greenshade. They are different kinds of paint: Citadel Coelia Greenshade is a wash/shade and Scale75 Boreal Green is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Boreal Green is a little darker, cooler than Coelia Greenshade. They are different kinds of paint.
The same difference applies the other way round: Coelia Greenshade is a little lighter, 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 Coelia Greenshade on the colour wheel See Boreal Green on the colour wheel
All matches: Coelia Greenshade equivalents · Boreal Green equivalents