ΔE 9.2, close: similar, with a visible difference side by side. UK Light Stone is a little darker, more muted than Karak Stone.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). UK Light Stone is a little darker, more muted than Karak Stone.
The same difference applies the other way round: Karak Stone is a little lighter, 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 Karak Stone on the colour wheel See UK Light Stone on the colour wheel
All matches: Karak Stone equivalents · UK Light Stone equivalents