ΔE 8.8, close: similar, with a visible difference side by side. Khaki is a little darker, more muted than Yellow FS33531.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Khaki is a little darker, more muted than Yellow FS33531.
The same difference applies the other way round: Yellow FS33531 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.
See Yellow FS33531 on the colour wheel See Khaki on the colour wheel
All matches: Yellow FS33531 equivalents · Khaki equivalents