They are different...

Although they are born on the same day, but they act differently....

LS tends to be more aggresive. She always grab MS's toy, book or whatever that MS is holding or playing... End up, MS will cry to complain....

However, when LS is playing with those toys that MS wanted to play with, MS will wait till LS is bored with it and leave it aside. She will faster go and take it and start playing after LS does not want to play it anymore....

LS tends to get sick easier, MS is stronger. LS is always the first to catch the bug.

Same same, but different...