Duplicate app names in battery optimization list

While troubleshooting a problem with the stock Android Phone app, I was thinking to let the phone app bypass battery optimization and see if that made any difference. I notice that in the battery optimization list there are two listings for "Phone" with similar blue handset icons in the battery optimization list (as well as one with a green robot icon, and a "Phone Services" and "Phone and Messaging Storage" and "Call Management" all with similar blue handset icons). Why do I have the apparent duplicate Phone app (with similar, not identical, icons) and how do I find out what the other, phone-related apps do? I have UNrooted Android 7.0 Nougat on a Motorola Droid Turbo 2. FWIW, I also see duplicate entries (including identical icons) for "Motorola Settings", "Photos" (with Google Photos icon), and "Setup Wizard". Thanks, Rebeccah