ΔE 16.6, loose: different enough that you should pick on purpose. Light Violet is a little lighter, warmer than Pale Indigo.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Light Violet is a little lighter, warmer than Pale Indigo.
The same difference applies the other way round: Pale Indigo is a little darker, cooler.
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 Pale Indigo on the colour wheel See Light Violet on the colour wheel
All matches: Pale Indigo equivalents · Light Violet equivalents