American express pulled my Transunion score on 10/29/13 and it was 672. On the same day I pulled my Quarterly Montering Transunion Score through myFico, it was a 582. All of the information regarding acoounts is the same on both reports. The only thing I noticed was that a CA on the my Fico report was listed in the accounts section not the collections section. Why such a big difference if myFico is really pulling from Transunion?
FICO version. I've read that Amex uses a FICO8 version, so if they pulled TU it is likely a TU08. The version on TUQM is TU98. One big difference is that TU98 scores charge cards, LOCs, and HELOCs a lot differently.