ΔE 11.6, fair: the same colour family, but not a straight swap. Russ. AF Light Blue is noticeably lighter, cooler than Soft Green.
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 noticeably lighter, cooler than Soft Green.
The same difference applies the other way round: Soft Green is noticeably darker, 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 Soft Green on the colour wheel See Russ. AF Light Blue on the colour wheel
All matches: Soft Green equivalents · Russ. AF Light Blue equivalents