ΔE 9.9, close: similar, with a visible difference side by side. Ryza Rust is more muted, cooler than Flickering Flame.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ryza Rust is more muted, cooler than Flickering Flame.
The same difference applies the other way round: Flickering Flame is more saturated, warmer.
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 Flickering Flame on the colour wheel See Ryza Rust on the colour wheel
All matches: Flickering Flame equivalents · Ryza Rust equivalents