|Yes they do. When you buy a toner cartridge from the original manufacture, they are brand new with new seals, imaging drums, wiper blades, and toner level sensors/electronics etc.|
When you buy a re-manufactured cartridge, they usually just refill the toner & empty the spent toner container, they don't replace worn parts and I have seen dozens of printers that needed to be thoroughly cleaned after a re-manufactured cartridge puked toner everywhere inside it. Not to mention, they don't reset the counter so you may get a cartridge that indicates it's out of toner even if it's full. Worn imaging drums and wipers will produce a poorer quality print.
Re-manufactured toner cartridges are much cheaper than new ones, but at what cost when it damages your printer from leaking toner.