ΔE 23.5, loose: different enough that you should pick on purpose. Bright Green is a little darker, much more muted, warmer than Russian Green 1.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Bright Green is a little darker, much more muted, warmer than Russian Green 1.
The same difference applies the other way round: Russian Green 1 is a little lighter, much more saturated, 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 Russian Green 1 on the colour wheel See Bright Green on the colour wheel
All matches: Russian Green 1 equivalents · Bright Green equivalents