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Why CANON NPG-88 Toner and CANON C-EXV65 toners have very different page yields even though they are for the same machine and sold for almost the same price?

Hello there, I am looking to bring in Canon ImageRunner C3326i Copier to my country, however I was stopped because I did not have the MSDS. And I am not able to find the MSDS for this particular model. If someone knows where to get it, kindly assist ...