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HI, I purchased a Canon PIXMA MG7720 multi-purpose printer and still have ink cartridges from my Canon MG 5520 printer. The cartridges appear to be identical when comparing them externally. My wonder is whether or not the 5520's cartridges are compatible with the 7720's cartridges when used to replace empty 7720 cartridges.
It appears not - the cartridges have different part numbers. But since you already have them, why not try one the next time you have an empty. They cheat you on Ink prices, you might as well try to cheat too.