That's the whole problem with all of the coral nick names. And then when you get a real popular one, all of a sudden it starts getting used for other corals, sometimes 'look alikes' from the 'original', sometimes completely different species, then it gets really confusing.
Back before echinos became popular there was really only 1 'alien eye' and it came from Tubs (the lineage might go further back than him even). Now that they are being collected it's become obvious that there are some crazy color morphs, many of them have the 'alien eye' look, which is really (nowadays) any bright yellow or green coralite with surrounding tissue of a contrasting color. I've seen 'alien eye' used to describe everything from zoanthids, to blastos. So you can kind of see where I'm headed with this example.
On a tangent I would use this as part of an argument to retire many of the LE corals that are out there. Sure you might not be able to get the exact coral very easily, but for some species (especially echinophyllia and micromussa for example) there are A LOT of colorful variants that are as nice or nicer than the origial. There is a time and place for everything though and some corals truly are unique.
[/end rant]