Lavender vs Dechala Lilac

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Dechala Lilac is a little darker, warmer than Lavender.

Can I use Dechala Lilac instead of Lavender?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dechala Lilac is a little darker, warmer than Lavender.

Can I use Lavender instead of Dechala Lilac?

The same difference applies the other way round: Lavender is a little lighter, 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.