Hot Pink vs Light Pink

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Light Pink is a little darker, more saturated than Hot Pink.

Can I use Light Pink instead of Hot Pink?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Pink is a little darker, more saturated than Hot Pink.

Can I use Hot Pink instead of Light Pink?

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