What is the difference between green and purple Endermen? [closed]

I've already seen the green-eyed endermen: enter image description here

and I know the basic story behind them. But what about these purple guys: enter image description here

with bright purple eyes and sparkly nether-portal-like particles around them? What's the difference between the two?

Here's a quote from the Minecraft wiki:

In the final release of 1.8, the Enderman's eyes are now purple, and instead of emitting smoke they emit nether portal particles.

So there's no difference between them, they have only changed up the skin a bit from the pre-release to the actual release.

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