ΔE 11.9, fair: the same colour family, but not a straight swap. UK Light Stone is noticeably lighter, more muted than Gun Corps Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). UK Light Stone is noticeably lighter, more muted than Gun Corps Brown.
The same difference applies the other way round: Gun Corps Brown is noticeably 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 Gun Corps Brown on the colour wheel See UK Light Stone on the colour wheel
All matches: Gun Corps Brown equivalents · UK Light Stone equivalents