ΔE 6.5, close: similar, with a visible difference side by side. Khaki is a little darker than Portland Stone No.64.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Khaki is a little darker than Portland Stone No.64.
The same difference applies the other way round: Portland Stone No.64 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 Portland Stone No.64 on the colour wheel See Khaki on the colour wheel
All matches: Portland Stone No.64 equivalents · Khaki equivalents