ΔE 17.2, loose: different enough that you should pick on purpose. Zamesi Desert is a little darker, much more saturated, warmer than Webbing Khaki.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Zamesi Desert is a little darker, much more saturated, warmer than Webbing Khaki.
The same difference applies the other way round: Webbing Khaki is a little lighter, much more muted, cooler.
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 Webbing Khaki on the colour wheel See Zamesi Desert on the colour wheel
All matches: Webbing Khaki equivalents · Zamesi Desert equivalents