Neutral Gray vs IDF Isr. Sand Grey (61-73)

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. IDF Isr. Sand Grey (61-73) is more saturated than Neutral Gray.

Can I use IDF Isr. Sand Grey (61-73) instead of Neutral Gray?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). IDF Isr. Sand Grey (61-73) is more saturated than Neutral Gray.

Can I use Neutral Gray instead of IDF Isr. Sand Grey (61-73)?

The same difference applies the other way round: Neutral Gray is 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.