When I saw this little duo's photo for the first time my first question was, "How do we tell them apart? They are so alike!!!"  Their mother replied, "One is outgoing, the other is quieter..." , so when they arrived at out studio we were ready to look for the clues :)  

At the beginning they both were very reserved, but little by little they warmed up to the idea and finished with a dance party.  Telling them apart was much easier than we thought, different colour pants helped a lot :)