Dark Olive Drab 41 vs Dark Boot Brown

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Dark Boot Brown is a little darker, warmer than Dark Olive Drab 41.

Can I use Dark Boot Brown instead of Dark Olive Drab 41?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Boot Brown is a little darker, warmer than Dark Olive Drab 41.

Can I use Dark Olive Drab 41 instead of Dark Boot Brown?

The same difference applies the other way round: Dark Olive Drab 41 is a little lighter, 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.