RAL 6003 Olivgrün opt.2 vs Dark Soviet Khaki

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Dark Soviet Khaki is a little lighter, more muted, warmer than RAL 6003 Olivgrün opt.2.

Can I use Dark Soviet Khaki instead of RAL 6003 Olivgrün opt.2?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Soviet Khaki is a little lighter, more muted, warmer than RAL 6003 Olivgrün opt.2.

Can I use RAL 6003 Olivgrün opt.2 instead of Dark Soviet Khaki?

The same difference applies the other way round: RAL 6003 Olivgrün opt.2 is a little darker, more saturated, cooler.

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.