ΔE 8.7, close: similar, with a visible difference side by side. Dark Mustard Khaki is a little darker, more saturated, cooler than MERDC Sand (FS30277).
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Mustard Khaki is a little darker, more saturated, cooler than MERDC Sand (FS30277).
The same difference applies the other way round: MERDC Sand (FS30277) is a little lighter, more muted, warmer.
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 MERDC Sand (FS30277) on the colour wheel See Dark Mustard Khaki on the colour wheel
All matches: MERDC Sand (FS30277) equivalents · Dark Mustard Khaki equivalents