ΔE 9.8, close: similar, with a visible difference side by side. Hoeth Blue is a little lighter, more muted than Arctic Gem.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Hoeth Blue is a little lighter, more muted than Arctic Gem.
The same difference applies the other way round: Arctic Gem is a little darker, more saturated.
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 Arctic Gem on the colour wheel See Hoeth Blue on the colour wheel
All matches: Arctic Gem equivalents · Hoeth Blue equivalents