ΔE 11.3, fair: the same colour family, but not a straight swap. Russ Grey is a little darker, warmer than AMT-7 Light Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Russ Grey is a little darker, warmer than AMT-7 Light Blue.
The same difference applies the other way round: AMT-7 Light Blue is a little lighter, 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 AMT-7 Light Blue on the colour wheel See Russ Grey on the colour wheel
All matches: AMT-7 Light Blue equivalents · Russ Grey equivalents