ΔE 11.6, fair: the same colour family, but not a straight swap. Burnt Sienna is a little lighter, more saturated than Molten Orange. They are different kinds of paint: Army Painter Molten Orange is an opaque base/layer paint and Golden Burnt Sienna is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Burnt Sienna is a little lighter, more saturated than Molten Orange. They are different kinds of paint.
The same difference applies the other way round: Molten Orange 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 Molten Orange on the colour wheel See Burnt Sienna on the colour wheel
All matches: Molten Orange equivalents · Burnt Sienna equivalents