ΔE 12.2, fair: the same colour family, but not a straight swap. Our swatches for the two are almost the same.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). The swatches are almost the same.
The same difference applies the other way round.
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 Mechanicus Standard Grey on the colour wheel See IJA Midouri Green on the colour wheel
All matches: Mechanicus Standard Grey equivalents · IJA Midouri Green equivalents