ΔE 6.7, close: similar, with a visible difference side by side. Blue Grey Pale is a little lighter than Dark Elf Highlight.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Blue Grey Pale is a little lighter than Dark Elf Highlight.
The same difference applies the other way round: Dark Elf Highlight is a little darker.
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 Dark Elf Highlight on the colour wheel See Blue Grey Pale on the colour wheel
All matches: Dark Elf Highlight equivalents · Blue Grey Pale equivalents