ΔE 11.7, fair: the same colour family, but not a straight swap. Bastion Grey is noticeably lighter, more muted, cooler than Death Korps Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Bastion Grey is noticeably lighter, more muted, cooler than Death Korps Drab.
The same difference applies the other way round: Death Korps Drab is noticeably darker, more saturated, 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 Korps Drab on the colour wheel See Bastion Grey on the colour wheel
All matches: Death Korps Drab equivalents · Bastion Grey equivalents