The UDI-DI codes for the device ID, which is a unique number per product and manufacturer. The UDI-DI is, in the human readable form or interpretation started with (01) and followed by a 14-digit number.
For manufacturers, the UDI-DI is uniquely to be created per device. Even though the device belongs to a device family, each “size” of the device needs an unique number to easily distinguish between the different products in the device family.