ΔE 10.7, fair: the same colour family, but not a straight swap. T'au Light Ochre is noticeably darker than RLM 79 (1941).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). T'au Light Ochre is noticeably darker than RLM 79 (1941).
The same difference applies the other way round: RLM 79 (1941) is noticeably 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 RLM 79 (1941) on the colour wheel See T'au Light Ochre on the colour wheel
All matches: RLM 79 (1941) equivalents · T'au Light Ochre equivalents