Marigold Yellow vs Parasite Brown

How close are they?

ΔE 17.7, loose: different enough that you should pick on purpose. Parasite Brown is noticeably darker, more muted, warmer than Marigold Yellow.

Can I use Parasite Brown instead of Marigold Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Parasite Brown is noticeably darker, more muted, warmer than Marigold Yellow.

Can I use Marigold Yellow instead of Parasite Brown?

The same difference applies the other way round: Marigold Yellow is noticeably lighter, more saturated, 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.