ΔE 21.3, loose: different enough that you should pick on purpose. Celestial Violet is a little lighter, more muted, cooler than Pearl Light Red. They are different kinds of paint: Tamiya Pearl Light Red is a pearl paint and Vallejo Celestial Violet is a metallic, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Celestial Violet is a little lighter, more muted, cooler than Pearl Light Red. They are different kinds of paint.
The same difference applies the other way round: Pearl Light Red is a little darker, 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 Pearl Light Red on the colour wheel See Celestial Violet on the colour wheel
All matches: Pearl Light Red equivalents · Celestial Violet equivalents