ΔE 6.5, close: similar, with a visible difference side by side. Titan Buff is more muted, cooler than Ivory White. They are different kinds of paint: Army Painter Ivory White is an opaque base/layer paint and Golden Titan Buff is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Titan Buff is more muted, cooler than Ivory White. They are different kinds of paint.
The same difference applies the other way round: Ivory White is more saturated, 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 Ivory White on the colour wheel See Titan Buff on the colour wheel
All matches: Ivory White equivalents · Titan Buff equivalents