Inktense Lime vs Ink Yellow

How close are they?

ΔE 66.9, loose: different enough that you should pick on purpose. Ink Yellow is noticeably lighter, much more saturated, warmer than Inktense Lime.

Can I use Ink Yellow instead of Inktense Lime?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 67). Ink Yellow is noticeably lighter, much more saturated, warmer than Inktense Lime.

Can I use Inktense Lime instead of Ink Yellow?

The same difference applies the other way round: Inktense Lime is noticeably darker, much 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.