Hi Iamv
Firstly, go through the Deploying Customizations Across Microsoft Dynamics AX 2012 Environments White Paper
www.microsoft.com/.../details.aspx
Here is explained very well the "import" process.
Take a look also to my old post, sinedax.blogspot.it/.../ax-2012-deploying-customizations-across.html
However, the best practice is use always the Modelstore.
In your case, there aren't issues because the XPO preserve the Origin GUID and the Model do the same.
So, when you will move the code again using Model, the first check is verify the object by GUID
Hope this help you.