The upgrades should be pretty seemless. However, to make them that way, make sure all of the software is compatible (check with manufacturer if necessary). Also, for much of it you might need another license, key, or code.
Hope this helps!
Maybe you coud use ANZOBJCVN OPTION(*COLLECT) and after, the same with option (*REPORT). A lot of old programs could appear for recompiling previous to migrate.