I have two sets of twin chickens. One set is Di and DiDi, the other is Buffy and Muffy. I honestly can't tell Di and DiDi apart unless they are standing still side by side. The only difference in the other two is Muffy's cheeks are slightly fluffier and she has a little bit darker feathers...
I think we finally came up with names for the rest of our ee/silkie and Japanese bantam/silkie crosses.
Roos
Mr. Obvious because he was SO roo from about 2 to 3 weeks old
Mr. E because he was a mystery until about a week or so ago
Pullets
Dee and DiDi about the only difference is one has 5...
We have DJ, PJ, and OJ. DJ after my sone since it hatched on his birthday. He had it named the day we set it since we knew that's when it should hatch. PJ after his previous teacher who hatched them since it was hatched on her birthday. OJ is a bantam barred rock that my son just had to have...
Mossyroo, I'd imagine it's like being around twins/triplets/etc. They all look the same until you get to know them, then wonder how you ever mixed them up.