take a look at my sig. it is very close for me but varies for others.
the PFICO weighs more heavily your credit card accounts so that is where the variance comes in.
I have a completely clean, but young credit card history(6mos-5yrs, avg. is 3 yrs) and you see the difference.
now someone who was late at some point or someone with a very long and strong CC history in comparison to the rest of their report might see more variance than i see.