ΔE 16.3, loose: different enough that you should pick on purpose. Orange Glaze is noticeably lighter, warmer than T'au Light Ochre. They are different kinds of paint: Citadel T'au Light Ochre is an opaque base/layer paint and Two Thin Coats Orange Glaze is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Orange Glaze is noticeably lighter, warmer than T'au Light Ochre. They are different kinds of paint.
The same difference applies the other way round: T'au Light Ochre is noticeably darker, cooler.
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 T'au Light Ochre on the colour wheel See Orange Glaze on the colour wheel
All matches: T'au Light Ochre equivalents · Orange Glaze equivalents