ΔE 18.4, loose: different enough that you should pick on purpose. Clear Blue is a little darker, cooler than Shyish Purple. They are different kinds of paint: Citadel Shyish Purple is a one-coat contrast-style paint and Reaper Clear Blue is an ink, glaze or transparent 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 18). Clear Blue is a little darker, cooler than Shyish Purple. They are different kinds of paint.
The same difference applies the other way round: Shyish Purple is a little lighter, 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 Shyish Purple on the colour wheel See Clear Blue on the colour wheel
All matches: Shyish Purple equivalents · Clear Blue equivalents