ΔE 8.8, close: similar, with a visible difference side by side. Aged White is a little darker, more saturated than Off White.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aged White is a little darker, more saturated than Off White.
The same difference applies the other way round: Off White 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 Off White on the colour wheel See Aged White on the colour wheel
All matches: Off White equivalents · Aged White equivalents