You can just set your Poser Runtime in the D|S preferences and have access to all your Poser files immediately.

I would, however, suggest you install the D|S specific files as well.  In relation to the surfaces, most Poser content will look much better after applying the D|S materials in Studio.  There are some pretty big differences particularly in skin settings, lights and MAT settings.

Poser specific files will work in D|S but you will find yourself making Surface parameter changes frequently if you are not using D|S specific settings.

Poser lights are always too bright for D|S.