ΔE 20.4, loose: different enough that you should pick on purpose. Etherium Blue is more muted, cooler than Lavender.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Etherium Blue is more muted, cooler than Lavender.
The same difference applies the other way round: Lavender is more saturated, 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 Lavender on the colour wheel See Etherium Blue on the colour wheel
All matches: Lavender equivalents · Etherium Blue equivalents