ΔE 14.3, fair: the same colour family, but not a straight swap. Castellax Bronze is a little lighter than Talos Bronze.
Can I use Castellax Bronze instead of Talos Bronze?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Castellax Bronze is a little lighter than Talos Bronze.
Can I use Talos Bronze instead of Castellax Bronze?
The same difference applies the other way round: Talos Bronze is a little darker.
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.