These were the only two of the same breed that differed so much in color shade (like my last two BR's) so I am endlessly curious as to the outcome. The more hens the better, but they're only about 2 weeks now.
Isn't the age you can't start to "tell" about 4 weeks?
Barred rock males are lighter than BR females because of the way the barring gene works. Your EE chicks don't have a barring gene, they're duckwing (or wildtype) patterened (and I mean the ones with the chipmunk stripes). That does mean, however, that you will be able to ask once they have some feathers (age 4 - 6 weeks) and get an accurate sex determination on them based on their feather patterns.
I have one that looked a whole lot like your light EE and she's an orangey-buff bird with black V patterning on her back and a black tail.
EE will be sexable much more by comb and feather pattern/color than by fluff color. The one on the left looks like its comb is already raised, which is indicative of a male. You'll also want to be keeping an eye on the shoulders and middle back - if brick red feathers start coming in it's a boy for sure.
Just because two EEs don't look anything alike doesn't mean ANYTHING except that they were mixed with different breeds! EEs are a mutt by trade, much like sex links, so you will almost never cross two that look similar and get similar babies! That's part of the fun with them