ΔE 11.9, fair: the same colour family, but not a straight swap. Necrotite Green is a little lighter, cooler than Gladeshard.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Necrotite Green is a little lighter, cooler than Gladeshard.
The same difference applies the other way round: Gladeshard 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 Gladeshard on the colour wheel See Necrotite Green on the colour wheel
All matches: Gladeshard equivalents · Necrotite Green equivalents