ΔE 14.3, fair: the same colour family, but not a straight swap. Graphite Green is a little darker than Gravelord Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Graphite Green is a little darker than Gravelord Grey.
The same difference applies the other way round: Gravelord Grey is a little lighter.
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 Gravelord Grey on the colour wheel See Graphite Green on the colour wheel
All matches: Gravelord Grey equivalents · Graphite Green equivalents