The manual way of doing this is much faster if you have already a model with all scenes.
1 - You save 3 copies of the model that has all scenes.
2 - You delete everything in that model
3 - You open copy 1 and import model 1
4 - Do the same for copy 2 and 3 and you now have all models with same scenes.
If you haven't got every scene in one model you can copy only the scenes you need from other models into the model with most scenes and save some work, and start from line 1 after that.
Besides Eneroth's plugin, if you install Thomthom's "camera tools", you can also easily copy camera properties from one model to the other.
If you use a plugin to copy camera positions between scenes you can, after that, copy properties between scenes by ticking/unticking the scene properties boxes on SU native scene manager.
I hope this helps.
JQL