ΔE 4.7, very close: most people won’t see a difference side by side. IJA Grey Green is a little lighter, cooler than Warm Grey.
Yes, for most jobs. Very close match (ΔE 5). IJA Grey Green is a little lighter, cooler than Warm Grey.
The same difference applies the other way round: Warm Grey is a little darker, 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 Warm Grey on the colour wheel See IJA Grey Green on the colour wheel
All matches: Warm Grey equivalents · IJA Grey Green equivalents