There is a way to determine what PTFs are missing from a particular product's environment, which is explained in this article.
Release : 5.0
Component : CA Bundl
To determine what PTFs have been applied to a particular target zone, run the following SMPLIST on the environment:
//XXXXXXXX JOB ...
//GIMSMP01 EXEC PGM=GIMSMP,REGION=0M,
//SMPLOG DD DUMMY
//SMPCNTL DD *
SET BDY(target_zone). /* INSTALLATION TARGET ZONE */
Then, compare the list of PTFs applied, including what PTFs have been superseded, to the list of available PTFs for the product, to determine the list of what is missing.