Skyshard vs Menoth White Highlight

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Menoth White Highlight is a little lighter, more saturated than Skyshard.

Can I use Menoth White Highlight instead of Skyshard?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Menoth White Highlight is a little lighter, more saturated than Skyshard.

Can I use Skyshard instead of Menoth White Highlight?

The same difference applies the other way round: Skyshard is a little darker, 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.