Do you run HAlion Sonic and Halion 5 together ?

Of course! H5 is the big brother.

I would not do that though. You may find yourself getting into some section with some controls, that would then feel missing going into HS2. If that’s what you mean by accurate picture… then yes HS2 has some internal features stripped away. It would be like starting Cubase 7.5 and going to Cubase 5.