Temple Guard Blue vs Arctic Blue

How close are they?

ΔE 21.0, loose: different enough that you should pick on purpose. Arctic Blue is noticeably lighter, more saturated, warmer than Temple Guard Blue.

Can I use Arctic Blue instead of Temple Guard Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Arctic Blue is noticeably lighter, more saturated, warmer than Temple Guard Blue.

Can I use Temple Guard Blue instead of Arctic Blue?

The same difference applies the other way round: Temple Guard Blue is noticeably darker, more muted, cooler.

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.