Old Rose vs Fulgrim Pink

How close are they?

ΔE 20.2, loose: different enough that you should pick on purpose. Fulgrim Pink is a little lighter, more saturated, cooler than Old Rose.

Can I use Fulgrim Pink instead of Old Rose?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Fulgrim Pink is a little lighter, more saturated, cooler than Old Rose.

Can I use Old Rose instead of Fulgrim Pink?

The same difference applies the other way round: Old Rose is a little darker, more muted, warmer.

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.