Under CA Easytrieve release 6.4, EZTPA00 was the load module always executed.
Release 11 introduced the concept of executing EZT and EZTCOM.
Please see informational apar RI01325:
In response to your requests, we have restored the ability to use PGM=EZTPA00 for running Compile-and-Link jobs and Compile-and-Go jobs. The PGM=EZTPA00 functionality is the same as in the 6.4 release. There is no need to edit the JCL to execute EZT or EZTCOM now.