Lens Flare Glow vs Phalanx Yellow

How close are they?

ΔE 20.6, loose: different enough that you should pick on purpose. Phalanx Yellow is a little darker, more muted, warmer than Lens Flare Glow.

Can I use Phalanx Yellow instead of Lens Flare Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Phalanx Yellow is a little darker, more muted, warmer than Lens Flare Glow.

Can I use Lens Flare Glow instead of Phalanx Yellow?

The same difference applies the other way round: Lens Flare Glow is a little lighter, 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.