replace a smart object with a similar smart object

Hi, 
I have been supplied with a series of banners (lots of sizes)  - with each size supplied as an artboard in seperate psd: eg:
320x480.psd
480x320.psd

I want to duplicate then into one psb with a seperate artboard for each size so I can make global text/image amends using the smart ojects

 If I duplicate the layers from one document to the other - all the layers and smart ojects are copied over with the same sames. so I end up with eg:

320x480 (artboard)
text (smart oject)
image (smart oject)

480x320 (artboard
text (smart oject)
image (smart oject)

But ... the smart objects are not the same - when you open them the imported version will have a '1' suffix - so global changes don't work.

Is there a way of replacing all the duplicatesso all my 'Text' and ' Images' smart objecst the the same? with out having to do it manually or change them all the linked items?

in AE I can alt drag a comp onto another selected comp from the project window and it does this - maintaining position, scaling etc..  hoping something similar - but I can't find it.