ΔE 14.5, fair: the same colour family, but not a straight swap. Fluorescent Pink is noticeably lighter, more muted than Volupus Pink. They are different kinds of paint: Citadel Volupus Pink is a one-coat contrast-style paint and Tamiya Fluorescent Pink is a fluorescent or effect paint, 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 15). Fluorescent Pink is noticeably lighter, more muted than Volupus Pink. They are different kinds of paint.
The same difference applies the other way round: Volupus Pink is noticeably darker, 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 Volupus Pink on the colour wheel See Fluorescent Pink on the colour wheel
All matches: Volupus Pink equivalents · Fluorescent Pink equivalents