ΔE 17.7, loose: different enough that you should pick on purpose. Ivory RLM05 is much more muted, warmer than Army Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Ivory RLM05 is much more muted, warmer than Army Green.
The same difference applies the other way round: Army Green is much more saturated, 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 Army Green on the colour wheel See Ivory RLM05 on the colour wheel
All matches: Army Green equivalents · Ivory RLM05 equivalents