ΔE 16.6, loose: different enough that you should pick on purpose. IAF Sand is a little darker, much more muted, warmer than Hammerfall Khaki.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). IAF Sand is a little darker, much more muted, warmer than Hammerfall Khaki.
The same difference applies the other way round: Hammerfall Khaki is a little lighter, much more saturated, 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 Hammerfall Khaki on the colour wheel See IAF Sand on the colour wheel
All matches: Hammerfall Khaki equivalents · IAF Sand equivalents