UPC *and* EAN ?

[cosmicray]

Most of the LEGO sets I sell have both a UPC and a EAN. The package is usually, but not always, marked with the UPC number/barcode.

But pretty much all of them have both assigned [1]. The European external packaging is slightly different, but the sets will be identical inside the box.

Is is possible (or helpful) to specify both the UPC and EAN in the attributes ? They are independently assigned, and one is not a subset of the other.

[1] the exceptions will be something promotional, that never made it to this side of the pond.