ΔE 11.4, fair: the same colour family, but not a straight swap. Techno Green is more saturated, cooler than Orruk Flesh. They are different kinds of paint: Citadel Orruk Flesh is an opaque base/layer paint and Scale75 Techno Green is a fluorescent or effect paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Techno Green is more saturated, cooler than Orruk Flesh. They are different kinds of paint.
The same difference applies the other way round: Orruk Flesh is 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 Orruk Flesh on the colour wheel See Techno Green on the colour wheel
All matches: Orruk Flesh equivalents · Techno Green equivalents