Light Orange vs Sacred Scarlet

How close are they?

ΔE 15.8, loose: different enough that you should pick on purpose. Sacred Scarlet is noticeably darker, more saturated than Light Orange.

Can I use Sacred Scarlet instead of Light Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Sacred Scarlet is noticeably darker, more saturated than Light Orange.

Can I use Light Orange instead of Sacred Scarlet?

The same difference applies the other way round: Light Orange is noticeably lighter, 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.