I think "EE" is often used as a catch all phrase, but to me an EE (sometimes called Americana) is the popular hatchery version of an Ameraucana. They have been bred for decades and have been quite consistent over the years. One hatchery has even trademarked the name Easter Egger. EEs are not Ameraucanas since they do not meet the breed standard, but they have been in production at many major hatcheries long before the Ameraucana breed was standardized and admitted into the APA. The long history of EE breeding with their pea combs and large dual purpose size has made them fairly easy to sex, usually by 6-7 weeks.
Other blue-green layers may not have the same characteristics or might be crossed with a slower developing breed and that can make sexing a little harder. So with your 2 adorable little OE crosses, I cannot see the combs well (on my phone) and not sure if the absence of wattles is because they are pullets or are they from EE stock and won't develop wattles at all.
They have small pale combs (I think they are pea combs), so not obviously males yet, but they are young. However, I do see some dark patchy coloring which can indicate males, but I don't have much experience with blue chicks. And again, they are a bit young and do a lot of growing and changing at 6 weeks.
Hope you post more pics in a week or so and we'll see!
As far as I know in Europe we have neither Ameraucanas, nor Americanas. In fact I guess we don't even have Easter Eggers. In Italy we call Olive Eggers all mixes between Marans and Legbars or Araucanas and their offspring, even when they don't lay olive eggs... this is why in my head Easter Eggers and Olive Eggers overlap a bit... but I think I understand what you meant now when you said that mine are mixes 
