What's the difference between epson 200 and 220 ink cartridges? Just bought a new Epson XP-420 to replace my old XP-400 and didn't realize till I got the printer home that the 400 uses 200 cartridges and the 420 uses 220 cartridges. They look the same physically that's not saying their the same chip/ink wise, I still a bunch of unused 200 cartridges from my old printer I'm hoping to use.