Ivory White vs Warm Flesh

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Warm Flesh is a little darker, more saturated than Ivory White.

Can I use Warm Flesh instead of Ivory White?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Warm Flesh is a little darker, more saturated than Ivory White.

Can I use Ivory White instead of Warm Flesh?

The same difference applies the other way round: Ivory White is a little lighter, 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.