ΔE 12.4, fair: the same colour family, but not a straight swap. Russ. AF Light Blue is a little darker, more muted, cooler than Pastel Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Russ. AF Light Blue is a little darker, more muted, cooler than Pastel Blue.
The same difference applies the other way round: Pastel Blue is a little lighter, more saturated, 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.
See Pastel Blue on the colour wheel See Russ. AF Light Blue on the colour wheel
All matches: Pastel Blue equivalents · Russ. AF Light Blue equivalents