ΔE 13.7, fair: the same colour family, but not a straight swap. Orange Magma is much more saturated, warmer than RLM 79 (1941).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Orange Magma is much more saturated, warmer than RLM 79 (1941).
The same difference applies the other way round: RLM 79 (1941) is much more muted, 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 RLM 79 (1941) on the colour wheel See Orange Magma on the colour wheel
All matches: RLM 79 (1941) equivalents · Orange Magma equivalents