ΔE 12.4, fair: the same colour family, but not a straight swap. Orruk Flesh is noticeably darker, warmer than Spectral Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Orruk Flesh is noticeably darker, warmer than Spectral Green.
The same difference applies the other way round: Spectral Green is noticeably lighter, 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 Spectral Green on the colour wheel See Orruk Flesh on the colour wheel
All matches: Spectral Green equivalents · Orruk Flesh equivalents