Indian Yellow Hue vs Sun Yellow

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Sun Yellow is a little darker, more saturated than Indian Yellow Hue.

Can I use Sun Yellow instead of Indian Yellow Hue?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Sun Yellow is a little darker, more saturated than Indian Yellow Hue.

Can I use Indian Yellow Hue instead of Sun Yellow?

The same difference applies the other way round: Indian Yellow Hue is a little lighter, 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.