It depends on what you’ve added to the Carrara Scene,. some things, like particles, physics, terrains, oceans, hair, plants, replicators, etc are all specific to Carrara, and will not transfer, .. or,.. at least,.. not easily..
Going from Carrara, back to DS is generally a backward step,
If the issues you’re having are related to the figures,. then the simple answer is to load the figures in the application you want to render them in. whether that’s DS or Carrara, or something else..
If the scene is something you’ve built in Carrara,.
It’s possible to export a scene as a single OBJ ,. which you could load into DS,.
but you don’t need to export the figures in a complex way. when you can export and load the “empty” Carrara scene, and then load the figures.
You can also export any individual models you’ve made in Carrara,. as OBJ models, and then load them into DS.
Shaders, camera’s and lights, are program specific and will need to be adjusted, or recreated in any other application.
DS to Carrara is also version dependent ,. DS4.5 scenes (DUF) will only load into the Beta version of Carrara 8.5
Hope it helps