I dont know if this is true, but I've read from multiple places that there will be a computer grader. (from AAMC website, kaplan, and friends)
Here's another source confirming that
http://www.princetonreview.com/medical/mcat-scoring.aspx?uidbadge=
"The two essays are scored on a J-T scale by one human and one computer grader. "
From this, I think it will be OK if someone's two essays are identical in format?
Feel free to correct me