Moonpetal vs Old Rose

How close are they?

ΔE 8.2, close: similar, with a visible difference side by side. Old Rose is more muted, warmer than Moonpetal.

Can I use Old Rose instead of Moonpetal?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Old Rose is more muted, warmer than Moonpetal.

Can I use Moonpetal instead of Old Rose?

The same difference applies the other way round: Moonpetal is 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.