What's the difference between GTIN and Code 128 barcodes?

Both barcodes are scannable and point to the same product.

The Global Trade Item Number (GTIN) is the globally recognised barcode number, typically found on your supplier's products or barcodes you've purchased from GS1.

View GS1's official page on GTIN barcodes for more information.

Code 128 barcodes are generated by Qblue Inventory when you print a barcode label for a product that doesn't already have a barcode assigned.