ΔE 15.6, loose: different enough that you should pick on purpose. Ivory RLM05 is noticeably lighter, cooler than Zandri Dust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Ivory RLM05 is noticeably lighter, cooler than Zandri Dust.
The same difference applies the other way round: Zandri Dust is noticeably darker, warmer.
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 Zandri Dust on the colour wheel See Ivory RLM05 on the colour wheel
All matches: Zandri Dust equivalents · Ivory RLM05 equivalents