Gladeshard vs Permanent Yellow

How close are they?

ΔE 43.7, loose: different enough that you should pick on purpose. Permanent Yellow is noticeably lighter, more saturated, warmer than Gladeshard.

Can I use Permanent Yellow instead of Gladeshard?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 44). Permanent Yellow is noticeably lighter, more saturated, warmer than Gladeshard.

Can I use Gladeshard instead of Permanent Yellow?

The same difference applies the other way round: Gladeshard is noticeably darker, more muted, 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.