ΔE 32.1, loose: different enough that you should pick on purpose. Blue Glacier is a little darker, more saturated, cooler than Pastel Lavender.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Blue Glacier is a little darker, more saturated, cooler than Pastel Lavender.
The same difference applies the other way round: Pastel Lavender is a little lighter, 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.
See Pastel Lavender on the colour wheel See Blue Glacier on the colour wheel
All matches: Pastel Lavender equivalents · Blue Glacier equivalents