The amateur Ektachrome series - Ektachrome, Elite, Elite II, Elite Chrome...diffs?

[B&Wpositive]

The amateur Ektachrome lineup has gone through everal revisions over the years.

Take Kodak ED-200: I've seen rolls labeled:
-Ektachrome ED-200
-Ektachrome Elite ED-200
-Ektachrome Elite II ED-200
-Elite Chrome ED-200

My question is, when were these different names implemented and what were the differences in each version. Also, what was the pro line equivalent to each?

Thanks!

 

[B&Wpositive]

No one knows???