Transparent Yellow Iron Oxide vs IJA Chrome Yellow

How close are they?

ΔE 16.1, loose: different enough that you should pick on purpose. IJA Chrome Yellow is a little darker, more saturated, warmer than Transparent Yellow Iron Oxide.

Can I use IJA Chrome Yellow instead of Transparent Yellow Iron Oxide?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). IJA Chrome Yellow is a little darker, more saturated, warmer than Transparent Yellow Iron Oxide.

Can I use Transparent Yellow Iron Oxide instead of IJA Chrome Yellow?

The same difference applies the other way round: Transparent Yellow Iron Oxide is a little lighter, 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.