ΔE 11.7, fair: the same colour family, but not a straight swap. Aluminium (Metal.) is more muted than Interference Violet (Fine). They are different kinds of paint: Golden Interference Violet (Fine) is a pearl paint and Vallejo Aluminium (Metal.) is a metallic, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Aluminium (Metal.) is more muted than Interference Violet (Fine). They are different kinds of paint.
The same difference applies the other way round: Interference Violet (Fine) is more saturated.
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 Interference Violet (Fine) on the colour wheel See Aluminium (Metal.) on the colour wheel
All matches: Interference Violet (Fine) equivalents · Aluminium (Metal.) equivalents