They might not behave in similar fashions but they do seem to produce similar results, at least in some cases.
Consider this. The Light in the Sunwell is cleansing the Fel taint from the Blood Elves thus their eyes returning to blue (or gold in the case of those strongly tied to the Light - Holy priests/Paladins?)
In the case of Void Elves, Silvermoon Scholars that join the Ren'dorei are having their Fel taint consumed by the Void energy thus their eyes returning to blue (or perhaps the new purple for those who become strongly tied to the Void - Shadow priests perhaps?)
They may function differently but they have a similar end result. In both cases the Fel taint is removed. Obviously player choice trumps canon lore as we can have Blood Elf Warlocks with golden eyes, but you get the gist of what I'm saying right?
The Light can heal wounds. The Void can also heal wounds. They may not do it in the same manner, but they do have a similar end result (wounds are healed).
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Well the game director says Void Elves are High Elves so I'm inclined to take his word over yours.