Karak Stone vs Tan (USAF)

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Tan (USAF) is more muted, warmer than Karak Stone.

Can I use Tan (USAF) instead of Karak Stone?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Tan (USAF) is more muted, warmer than Karak Stone.

Can I use Karak Stone instead of Tan (USAF)?

The same difference applies the other way round: Karak Stone is 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.