CARC Tan 686A (FS33446) vs Deep Khaki Drill

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Deep Khaki Drill is a little darker, more muted than CARC Tan 686A (FS33446).

Can I use Deep Khaki Drill instead of CARC Tan 686A (FS33446)?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Deep Khaki Drill is a little darker, more muted than CARC Tan 686A (FS33446).

Can I use CARC Tan 686A (FS33446) instead of Deep Khaki Drill?

The same difference applies the other way round: CARC Tan 686A (FS33446) is a little lighter, more saturated.

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.