ΔE 5.0, very close: most people won’t see a difference side by side. Grass Green is a little darker than Waystone Green. They are different kinds of paint: Citadel Waystone Green is a technical paint or medium and Reaper Grass Green is an opaque base/layer 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 5). Grass Green is a little darker than Waystone Green. They are different kinds of paint.
The same difference applies the other way round: Waystone Green is a little lighter.
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 Grass Green on the colour wheel
All matches: Waystone Green equivalents · Grass Green equivalents