ΔE 12.5, fair: the same colour family, but not a straight swap. Light Green Blue is a little darker, more saturated than Moonstone Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Light Green Blue is a little darker, more saturated than Moonstone Grey.
The same difference applies the other way round: Moonstone Grey is a little lighter, 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 Moonstone Grey on the colour wheel See Light Green Blue on the colour wheel
All matches: Moonstone Grey equivalents · Light Green Blue equivalents