ΔE 8.6, close: similar, with a visible difference side by side. Transparent Cold Green is a little darker, more saturated, warmer than Waystone Green. They are different kinds of paint: Citadel Waystone Green is a technical paint or medium and Green Stuff World Transparent Cold Green is an ink, glaze or transparent 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). Transparent Cold Green is a little darker, more saturated, warmer than Waystone Green. They are different kinds of paint.
The same difference applies the other way round: Waystone Green is a little lighter, more muted, 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 Waystone Green on the colour wheel See Transparent Cold Green on the colour wheel
All matches: Waystone Green equivalents · Transparent Cold Green equivalents