Old Red vs Talisman Purple

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Talisman Purple is a little lighter, cooler than Old Red.

Can I use Talisman Purple instead of Old Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Talisman Purple is a little lighter, cooler than Old Red.

Can I use Old Red instead of Talisman Purple?

The same difference applies the other way round: Old Red is a little darker, 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.