Magenta Tone vs Magenta Wash

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Magenta Wash is a little lighter, more saturated, warmer than Magenta Tone.

Can I use Magenta Wash instead of Magenta Tone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Magenta Wash is a little lighter, more saturated, warmer than Magenta Tone.

Can I use Magenta Tone instead of Magenta Wash?

The same difference applies the other way round: Magenta Tone is a little darker, 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.