As promised by the government the new Zimbabwean dollar currency notes will be issued at par with the current bond $2 and $5 bond notes that are already in circulation. It seems the bond notes and new Zimbabwean dollar are not only equal in value, but corresponding notes will look almost the same.
That means the new $2 note will also be green just like the current $2 bond note. Just like the $5 bond note is purple so will be the new Zimbabwean dollar $5 note. The idea is to lessen confusion I think.
These details are contained in Statutory Instrument 231 of 2019.