Bright Pale Green vs Insignia White

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Insignia White is a little lighter, much more muted, warmer than Bright Pale Green.

Can I use Insignia White instead of Bright Pale Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Insignia White is a little lighter, much more muted, warmer than Bright Pale Green.

Can I use Bright Pale Green instead of Insignia White?

The same difference applies the other way round: Bright Pale Green is a little darker, 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.