Miami Sunset vs Ruby Red

How close are they?

ΔE 24.3, loose: different enough that you should pick on purpose. Ruby Red is noticeably darker, more muted, warmer than Miami Sunset.

Can I use Ruby Red instead of Miami Sunset?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Ruby Red is noticeably darker, more muted, warmer than Miami Sunset.

Can I use Miami Sunset instead of Ruby Red?

The same difference applies the other way round: Miami Sunset is noticeably lighter, more saturated, 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.