Ryza Rust vs Yellow Ochre

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Yellow Ochre is more muted than Ryza Rust.

Can I use Yellow Ochre instead of Ryza Rust?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Yellow Ochre is more muted than Ryza Rust.

Can I use Ryza Rust instead of Yellow Ochre?

The same difference applies the other way round: Ryza Rust is 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.