ΔE 17.0, loose: different enough that you should pick on purpose. Ryza Rust is a little darker, much more saturated than RLM 79 (1941).
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Ryza Rust is a little darker, much more saturated than RLM 79 (1941).
The same difference applies the other way round: RLM 79 (1941) is a little lighter, much more muted.
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 Ryza Rust on the colour wheel
All matches: RLM 79 (1941) equivalents · Ryza Rust equivalents