ΔE 10.1, fair: the same colour family, but not a straight swap. Transparent Phthalo Green (Blue Shade) is a little lighter than Elemental Bolt. They are different kinds of paint: Army Painter Elemental Bolt is an opaque base/layer paint and Golden Transparent Phthalo Green (Blue Shade) is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Transparent Phthalo Green (Blue Shade) is a little lighter than Elemental Bolt. They are different kinds of paint.
The same difference applies the other way round: Elemental Bolt 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.
See Elemental Bolt on the colour wheel See Transparent Phthalo Green (Blue Shade) on the colour wheel
All matches: Elemental Bolt equivalents · Transparent Phthalo Green (Blue Shade) equivalents