Yes, the ink cartridges that come with the Wacom Sketchpad Pro, Bamboo Slate, Bamboo Folio, and Bamboo Spark are unique to the product. The copper coating on the cartridge helps the communication between the pen and the Smartpad.
The Finetip Refill is silver and the Ballpoint Refill is gold. Do not try to use the Ballpoint refill with the Finetip Pen or vice versa. This is not supported and will not perform as expected, especially at low pressure levels.