Bleached Strap Grey vs US Olive Drab

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. US Olive Drab is more saturated than Bleached Strap Grey.

Can I use US Olive Drab instead of Bleached Strap Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). US Olive Drab is more saturated than Bleached Strap Grey.

Can I use Bleached Strap Grey instead of US Olive Drab?

The same difference applies the other way round: Bleached Strap Grey is more muted.

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.