British Camo Green vs Contagion Green

How close are they?

ΔE 17.7, loose: different enough that you should pick on purpose. Contagion Green is noticeably lighter, much more muted than British Camo Green.

Can I use Contagion Green instead of British Camo Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Contagion Green is noticeably lighter, much more muted than British Camo Green.

Can I use British Camo Green instead of Contagion Green?

The same difference applies the other way round: British Camo Green 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.