ΔE 6.5, close: similar, with a visible difference side by side. AMT-7 Greyish Blue is a little darker, more saturated than Light Sea Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). AMT-7 Greyish Blue is a little darker, more saturated than Light Sea Gray.
The same difference applies the other way round: Light Sea Gray 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 Light Sea Gray on the colour wheel See AMT-7 Greyish Blue on the colour wheel
All matches: Light Sea Gray equivalents · AMT-7 Greyish Blue equivalents