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Can you add more detail on your problem. Are you the owner of the PCB designs? If so, you can just create a multi-layer PCB. With this are associated design considerations.
If you're not the owner of the PCB designs, how were you hoping to combine them?
I would combine the two in a multi-layer PCB. I would look up design rules for PCB design
across multiple layers. You should find plenty of white documents to help you.
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