ΔE 15.4, loose: different enough that you should pick on purpose. Cerulean Blue, Chromium is a little lighter, more saturated, warmer than Talassar Blue. They are different kinds of paint: Citadel Talassar Blue is a one-coat contrast-style paint and Golden Cerulean Blue, Chromium is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Cerulean Blue, Chromium is a little lighter, more saturated, warmer than Talassar Blue. They are different kinds of paint.
The same difference applies the other way round: Talassar Blue is a little darker, more muted, 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.
See Talassar Blue on the colour wheel See Cerulean Blue, Chromium on the colour wheel
All matches: Talassar Blue equivalents · Cerulean Blue, Chromium equivalents