ΔE 6.7, close: similar, with a visible difference side by side. Transparent Red Iron Oxide is a little darker, more saturated than Magmadroth Flame. They are different kinds of paint: Citadel Magmadroth Flame is a one-coat contrast-style paint and Golden Transparent Red Iron Oxide is an opaque base/layer 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 7). Transparent Red Iron Oxide is a little darker, more saturated than Magmadroth Flame. They are different kinds of paint.
The same difference applies the other way round: Magmadroth Flame is a little lighter, 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 Magmadroth Flame on the colour wheel See Transparent Red Iron Oxide on the colour wheel
All matches: Magmadroth Flame equivalents · Transparent Red Iron Oxide equivalents