ΔE 6.9, close: similar, with a visible difference side by side. Blue Gorkshroom is a little lighter, more saturated than Regal Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Blue Gorkshroom is a little lighter, more saturated than Regal Blue.
The same difference applies the other way round: Regal Blue is a little darker, more muted.
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 Regal Blue on the colour wheel See Blue Gorkshroom on the colour wheel
All matches: Regal Blue equivalents · Blue Gorkshroom equivalents