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I have a question I hope someone can answer. I have two Epson printers - Stylus Photo R340 and a CX6400. Both the ink cartridges are identical in every way (at least to the eye). One cartridge will fit perfectly into the slot of both printers - e.g. a T0481 black (R340) cartridge will snap into the CX6400 but it reads as an error so it will not print. Can someone tell me what the difference is other than the T0481(R340) and number T0441 (CX6400). It sounds like a money-making machine to buy different cartridges instead of being able to interchange them. Is there any way to manipulate the printer to recognize the cartridge. Thank you, johmac