ΔE 21.9, loose: different enough that you should pick on purpose. Viridian Green is noticeably darker, more muted, cooler than Krieg Khaki.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Viridian Green is noticeably darker, more muted, cooler than Krieg Khaki.
The same difference applies the other way round: Krieg Khaki is noticeably lighter, 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 Krieg Khaki on the colour wheel See Viridian Green on the colour wheel
All matches: Krieg Khaki equivalents · Viridian Green equivalents