Carbon Black vs Olive Green RLM80

How close are they?

ΔE 16.9, loose: different enough that you should pick on purpose. Olive Green RLM80 is noticeably lighter, more saturated than Carbon Black.

Can I use Olive Green RLM80 instead of Carbon Black?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Olive Green RLM80 is noticeably lighter, more saturated than Carbon Black.

Can I use Carbon Black instead of Olive Green RLM80?

The same difference applies the other way round: Carbon Black is noticeably darker, 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.