ΔE 11.6, fair: the same colour family, but not a straight swap. German Gray is noticeably lighter, more muted than Scarab Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). German Gray is noticeably lighter, more muted than Scarab Green.
The same difference applies the other way round: Scarab Green is noticeably darker, more saturated.
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 Scarab Green on the colour wheel See German Gray on the colour wheel
All matches: Scarab Green equivalents · German Gray equivalents