Military Shade vs Oblivion Black Wash

How close are they?

ΔE 34.4, loose: different enough that you should pick on purpose. Oblivion Black Wash is noticeably lighter, much more muted than Military Shade.

Can I use Oblivion Black Wash instead of Military Shade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 34). Oblivion Black Wash is noticeably lighter, much more muted than Military Shade.

Can I use Military Shade instead of Oblivion Black Wash?

The same difference applies the other way round: Military Shade is noticeably darker, 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.