Porcelain Rose vs Salmon Rose

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Salmon Rose is much more saturated, warmer than Porcelain Rose.

Can I use Salmon Rose instead of Porcelain Rose?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Salmon Rose is much more saturated, warmer than Porcelain Rose.

Can I use Porcelain Rose instead of Salmon Rose?

The same difference applies the other way round: Porcelain Rose 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.