ΔE 7.2, close: similar, with a visible difference side by side. Warm Grey is more saturated, warmer than Iridescent Pink/Gold. They are different kinds of paint: Tamiya Iridescent Pink/Gold is a pearl paint and Vallejo Warm Grey is an opaque base/layer 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). Warm Grey is more saturated, warmer than Iridescent Pink/Gold. They are different kinds of paint.
The same difference applies the other way round: Iridescent Pink/Gold is more muted, 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 Iridescent Pink/Gold on the colour wheel See Warm Grey on the colour wheel
All matches: Iridescent Pink/Gold equivalents · Warm Grey equivalents