If it's your intention to make use of the logic from one .capx in the other, then just copying across all the objects and events is pointless.
Is this what you require?
If so, then even if you make sure that both .capx use the same Layout/Layer structure and names, and all the objects and variables from both have matching names, then the Event logic from one would still not probably make sense if just copied across from one to the other.
The Events would need to be understood and carefully integrated, maybe as extra conditions or sub-events. This would not necessarily be an easy task.
Is this what you mean by copying from one to the other?
If so, I hope you see that it generally won't be as easy as just copying from one to the other.