ΔE 15.8, loose: different enough that you should pick on purpose. Cream White is a little lighter, warmer than Light Gray.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Cream White is a little lighter, warmer than Light Gray.
The same difference applies the other way round: Light Gray is a little darker, cooler.
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 Light Gray on the colour wheel See Cream White on the colour wheel
All matches: Light Gray equivalents · Cream White equivalents