ΔE 15.0, loose: different enough that you should pick on purpose. Light Moss Green is a little darker, cooler than Dark Mustard Khaki.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Light Moss Green is a little darker, cooler than Dark Mustard Khaki.
The same difference applies the other way round: Dark Mustard Khaki is a little lighter, 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 Dark Mustard Khaki on the colour wheel See Light Moss Green on the colour wheel
All matches: Dark Mustard Khaki equivalents · Light Moss Green equivalents