Hot Pink vs Devil Red

How close are they?

ΔE 22.1, loose: different enough that you should pick on purpose. Devil Red is much more saturated, warmer than Hot Pink.

Can I use Devil Red instead of Hot Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Devil Red is much more saturated, warmer than Hot Pink.

Can I use Hot Pink instead of Devil Red?

The same difference applies the other way round: Hot Pink is much 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.