AFAIK it should work,
but you should check the 'Standard CMP 2.x EntityBean' configuration in the standardjboss.xml file.
As i know there are changes because of PesimisticLock ==> instancePerTransaction behaviour. This might be a big difference.
What you can do is to copy the container you want in your jboss.xml or change the standardjboss.xml configuration.
Thanks a lot