Interior Light Green vs A-28M Greyish Blue

How close are they?

ΔE 11.5, fair: the same colour family, but not a straight swap. A-28M Greyish Blue is a little darker, cooler than Interior Light Green.

Can I use A-28M Greyish Blue instead of Interior Light Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). A-28M Greyish Blue is a little darker, cooler than Interior Light Green.

Can I use Interior Light Green instead of A-28M Greyish Blue?

The same difference applies the other way round: Interior Light Green is a little lighter, warmer.

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.