Deep Khaki Drill vs Granite Grey

How close are they?

ΔE 18.0, loose: different enough that you should pick on purpose. Granite Grey is a little darker, much more muted than Deep Khaki Drill.

Can I use Granite Grey instead of Deep Khaki Drill?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Granite Grey is a little darker, much more muted than Deep Khaki Drill.

Can I use Deep Khaki Drill instead of Granite Grey?

The same difference applies the other way round: Deep Khaki Drill is a little lighter, much 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.