ΔE 8.2, close: similar, with a visible difference side by side. IJA Grey Green is a little lighter, more saturated, cooler than Rakarth Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IJA Grey Green is a little lighter, more saturated, cooler than Rakarth Flesh.
The same difference applies the other way round: Rakarth Flesh is a little darker, more muted, 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 Rakarth Flesh on the colour wheel See IJA Grey Green on the colour wheel
All matches: Rakarth Flesh equivalents · IJA Grey Green equivalents