What else is different on your reports? Age of oldest account, average age, number of accounts, type of accounts, etc.
I'm guessing that you two are in two different score buckets, so the identical action creates different results for your scores.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007