CICS dump reading does not change by the dump code -- you read them all the same.
However, you need to be aware that AUEP does NOT imply -- in any way -- that a transaction loop occurred. From the Messages and Codes
Explanation: The task has been abnormally terminated because a return code of UERCPURG has been sent to the User Exit Handler by a User Exit Program. The value of UERCPURG is defined by the macro DFHUEXIT TYPE=EP, ID=xxxxxxxx, where xxxxxxxx is the exit point by which the exit program is enabled. This code does not apply to exit points in domains. The exit program returns this value when it has made a request for CICS services using the exit programming Interface (XPI) and when the XPI call has had a RESPONSE code of PURGED. Exit programs must not set UERCPURG return code under any other circumstance.
While the purge may have been due to transaction looping, there is no guarantee that this is your problem.