Hello Daniel,
since EWM 7.02 multiple EAN/GTIN codes are supported in the master data.
See Additional GTINs (EANs/UPCs) for Product - Warehouse Structure - SAP Library
The multiple EAN are then transferred from ERP via CIF just any other master data attributes.
You can find them in the product master data maintenance, there is a separate tab for the additional EANs.
And yes of course if you scan an "multiple" EAN it will identify the product. So whereever you can scan an EAN it does not matter if it is the "main" EAN or an "additional" EAN.
Best regards
Markus