Since scene animation is baked into the scene file itself, you unfortunately can't reference it. In theory you can reference another scene file using some load scene trigger action, but you probably don't want to actually load the entire other scene.
The only ways in which you could reference a scene animation as a standalone thing that would prevent you from having to duplicate the animation data in your own release would be if the original scene var contained the animation as a standalone file. This could be in the form of a Legacy Pose, a MocapSwitcher json file, a Timeline export file, a Plugin Preset containing a Timeline instance... but nobody does any of that, they just have the animation baked into the scene itself. So the only option is to duplicate the animation. Animation reusability has been and continues to be a big problem in VaM, unfortunately.