ΔE 11.5, fair: the same colour family, but not a straight swap. Yellow Ochre is a little darker, cooler than Orange Magma. They are different kinds of paint: Army Painter Orange Magma is an opaque base/layer paint and Golden Yellow Ochre 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). Yellow Ochre is a little darker, cooler than Orange Magma. They are different kinds of paint.
The same difference applies the other way round: Orange Magma is a little lighter, 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 Orange Magma on the colour wheel See Yellow Ochre on the colour wheel
All matches: Orange Magma equivalents · Yellow Ochre equivalents