Drain Life vs Nuclear Yellow

How close are they?

ΔE 26.1, loose: different enough that you should pick on purpose. Nuclear Yellow is a little darker, much more saturated than Drain Life.

Can I use Nuclear Yellow instead of Drain Life?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Nuclear Yellow is a little darker, much more saturated than Drain Life.

Can I use Drain Life instead of Nuclear Yellow?

The same difference applies the other way round: Drain Life is a little lighter, much more muted.

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.