ΔE 7.5, close: similar, with a visible difference side by side. Cayman Green is a little darker than Light Soviet Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Cayman Green is a little darker than Light Soviet Khaki.
The same difference applies the other way round: Light Soviet Khaki is a little lighter.
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 Light Soviet Khaki on the colour wheel See Cayman Green on the colour wheel
All matches: Light Soviet Khaki equivalents · Cayman Green equivalents