ΔE 9.3, close: similar, with a visible difference side by side. T'au Light Ochre is a little darker than Matt Orange. They are different kinds of paint: AMMO by Mig Matt Orange is an ink, glaze or transparent paint and Citadel T'au Light Ochre 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 9). T'au Light Ochre is a little darker than Matt Orange. They are different kinds of paint.
The same difference applies the other way round: Matt Orange is a little lighter.
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 Matt Orange on the colour wheel See T'au Light Ochre on the colour wheel
All matches: Matt Orange equivalents · T'au Light Ochre equivalents