ΔE 19.8, loose: different enough that you should pick on purpose. Pink is noticeably lighter, much more muted than Hot Pink.
Can I use Pink instead of Hot Pink?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Pink is noticeably lighter, much more muted than Hot Pink.
Can I use Hot Pink instead of Pink?
The same difference applies the other way round: Hot Pink is noticeably darker, much more saturated.
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.