Faded Purple vs Light Violet

How close are they?

ΔE 20.4, loose: different enough that you should pick on purpose. Light Violet is a little lighter, much more saturated, cooler than Faded Purple.

Can I use Light Violet instead of Faded Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Light Violet is a little lighter, much more saturated, cooler than Faded Purple.

Can I use Faded Purple instead of Light Violet?

The same difference applies the other way round: Faded Purple is a little darker, much more muted, 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.