ΔE 42.2, loose: different enough that you should pick on purpose. Pale Violet Red is noticeably darker, much more muted than Familiar Pink. They are different kinds of paint: Army Painter Familiar Pink is a one-coat contrast-style paint and Reaper Pale Violet Red is an opaque base/layer paint, 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 42). Pale Violet Red is noticeably darker, much more muted than Familiar Pink. They are different kinds of paint.
The same difference applies the other way round: Familiar Pink is noticeably lighter, much 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 Familiar Pink on the colour wheel See Pale Violet Red on the colour wheel
All matches: Familiar Pink equivalents · Pale Violet Red equivalents