Canvas Tone vs Dark Soviet Khaki

How close are they?

ΔE 6.0, close: similar, with a visible difference side by side. Dark Soviet Khaki is a little darker, more muted than Canvas Tone.

Can I use Dark Soviet Khaki instead of Canvas Tone?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Soviet Khaki is a little darker, more muted than Canvas Tone.

Can I use Canvas Tone instead of Dark Soviet Khaki?

The same difference applies the other way round: Canvas Tone is a little lighter, 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.