There may be no issue, there may be many. Bp's are known to be picky. Some will only take rats and others will only take mice. Some will only take live and some will only hit pre killed, and others will eat anything put in front of them. Is it possible to try the switch before the trade? If so read up on proper feeding of F/T methods and ways of switching them over if you arent already familiar with them and give it a shot. Only way to know for sure is to try.