ΔE 9.1, close: similar, with a visible difference side by side. Catachan Flesh is a little darker than RLM 79 (1942).
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Catachan Flesh is a little darker than RLM 79 (1942).
The same difference applies the other way round: RLM 79 (1942) 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 RLM 79 (1942) on the colour wheel See Catachan Flesh on the colour wheel
All matches: RLM 79 (1942) equivalents · Catachan Flesh equivalents