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JimBI would guess that the orange E94s are the result of some sort of messed up red mix print run that probably resulted in several sets worth making it to the streets. Since they would have all come from the same print run/ print mixture, they all would have the same shade and tone. The orange T206 Cobb probably occurred a number of times on different print-runs,accounting for the variation in tone.
Don't get me wrong, I think the orange E94s are very cool, I would love to own one (or more ), but I do not think they were an originally intended color of the manufacturer. Just my opinion. In that sense, I would not see them as a necessary component of an E94 master set.
JimB