Lavender vs Blue Violet

How close are they?

ΔE 16.2, loose: different enough that you should pick on purpose. Blue Violet is noticeably darker, more saturated than Lavender.

Can I use Blue Violet instead of Lavender?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Blue Violet is noticeably darker, more saturated than Lavender.

Can I use Lavender instead of Blue Violet?

The same difference applies the other way round: Lavender is noticeably lighter, more muted.

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.