ΔE 14.7, fair: the same colour family, but not a straight swap. Sap Green is noticeably darker, cooler than Death Guard Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Sap Green is noticeably darker, cooler than Death Guard Green.
The same difference applies the other way round: Death Guard Green is noticeably lighter, 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 Death Guard Green on the colour wheel See Sap Green on the colour wheel
All matches: Death Guard Green equivalents · Sap Green equivalents