British Camo Green vs Rocket Green

How close are they?

ΔE 21.5, loose: different enough that you should pick on purpose. Rocket Green is noticeably darker, much more saturated than British Camo Green.

Can I use Rocket Green instead of British Camo Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Rocket Green is noticeably darker, much more saturated than British Camo Green.

Can I use British Camo Green instead of Rocket Green?

The same difference applies the other way round: British Camo Green is noticeably lighter, much 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.