As a veteran with years of experience you should know that the human hearing is not a fixed given. It changes from day to day, hour to hour. Also the way you experience music emotionally is influenced by so many factors that far outweigh the possibility that this new build has brought sonic changes.
Spend some more time listening to it, you will most likely find it sounds the same. If not, it would probably be better practice to troubleshoot other aspects of your system.