Can I use GS1 Ireland GTINs on all Amazon websites?

Yes, you can use your barcodes on all Amazon websites.

Your GS1 Ireland GTINs are numbers that uniquely identify your products across the globe. The barcode number for each of your products will be shared on all Amazon websites. In fact, a GS1 GTIN works on marketplaces everywhere in the world as well as in traditional bricks-and-mortar retail stores.