ΔE 9.4, close: similar, with a visible difference side by side. Magmadroth Flame is a little lighter than Light Rust. They are different kinds of paint: AMMO by Mig Light Rust is an opaque base/layer paint and Citadel Magmadroth Flame is a one-coat contrast-style 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 9). Magmadroth Flame is a little lighter than Light Rust. They are different kinds of paint.
The same difference applies the other way round: Light Rust is a little darker.
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 Light Rust on the colour wheel See Magmadroth Flame on the colour wheel
All matches: Light Rust equivalents · Magmadroth Flame equivalents