ΔE 11.5, fair: the same colour family, but not a straight swap. Space Grey is a little lighter, more saturated than Graphite Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Space Grey is a little lighter, more saturated than Graphite Green.
The same difference applies the other way round: Graphite Green is a little darker, more muted.
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 Graphite Green on the colour wheel See Space Grey on the colour wheel
All matches: Graphite Green equivalents · Space Grey equivalents