You can put your content in external Runtimes and link from both applications. I have folders called Animals, Clothes, Hair, Monsters, People, Plants, Props and Scenes, each with a Runtime in it: other people split by genre (Fanatsy, SF, Modern) or figure (Victoria 3, James, Koshini) - use whatever system you fancy (or none). As I said, the only possible issues I know of are making sure Poser doesn't use External Binary Morph targets until their import into D|S is definitely fixed, and possibly putting the Delta and ChanVis files for injectable morphs (things like Runtimelibraries!DAZ) in the main Poser Runtime.