ΔE 8.4, close: similar, with a visible difference side by side. Blazing Ink is a little lighter, more saturated than Ryza Rust. They are different kinds of paint: Citadel Ryza Rust is an opaque base/layer paint and Formula P3 Blazing Ink is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Blazing Ink is a little lighter, more saturated than Ryza Rust. They are different kinds of paint.
The same difference applies the other way round: Ryza Rust is a little 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.
See Ryza Rust on the colour wheel See Blazing Ink on the colour wheel
All matches: Ryza Rust equivalents · Blazing Ink equivalents