We used Camera Selector to render an animatic scene once and that worked flawlessly. But, I didn’t know that the resolution has to be the same though (apparently I was lucky that time). 
I’m not sure though, if it would work with screamernet. Have to test it someday.
Also, worth mentioning is that there are TWO Camera Selectors (you may have noticed it too). One that is called “CameraSelector” and another called “Camera Selector”. Notice the HUGE (not) different name! The one I show in the video is the new version. The other is an older version that should be compatible with older versions of LW.
I know for a fact that the one I used when I rendered an animatic was the “old” version, because it was in LW8.x.
EDIT: The docs seem to be outdated though…