Freddie Mac’s MBS prepayments clocked in at considerably slower speeds than Fannie Mae’s last month, Wall Street analysts report, continuing the year-long role reversal in the prepayment relationship between the two agencies. According to Dale Westhoff, a Bear Stearns analyst, the differential between Fannie and Freddie is wider now than it was at the peak of the 2003 refinancing boom – but with Fannie pools now prepaying faster. The change, he said, has to