ΔE 20.9, loose: different enough that you should pick on purpose. Salmon Rose is noticeably lighter, more muted than Ruby Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Salmon Rose is noticeably lighter, more muted than Ruby Red.
The same difference applies the other way round: Ruby Red is noticeably darker, 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.
See Ruby Red on the colour wheel See Salmon Rose on the colour wheel
All matches: Ruby Red equivalents · Salmon Rose equivalents