APC Interior Light Green (FS24533) vs Off-White

How close are they?

ΔE 9.9, close: similar, with a visible difference side by side. Off-White is a little lighter, warmer than APC Interior Light Green (FS24533).

Can I use Off-White instead of APC Interior Light Green (FS24533)?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Off-White is a little lighter, warmer than APC Interior Light Green (FS24533).

Can I use APC Interior Light Green (FS24533) instead of Off-White?

The same difference applies the other way round: APC Interior Light Green (FS24533) is a little darker, 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.