Credit score different

[Tom Server]

So I always thrived on having good credit.. I use credit karma and I go to the major company sites to view my score.  I applied for a mortgage for SOFI they sent me a letter with my credit score got sent.  My credit score on the letter was a  695 for Equifax with a 9/20 date... I went to the Equifax website and my score was a 817. I called Equifax to question why Sofi would show a 695 score and on the site I show a 817.. she said Sofi was using old data, and to tell them to call to confirm the up to date data.. is this true?  Can the score really be that much different?