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Comparing printed pages capacity of the brother tn630 vs tn660.
The main differences between the two toners is the page yield capacity. The tn660 is a high yield toner (basically that just means they filled it with more toner).
The tn660 does cost more if you buy genuine brother but a far smarted decision is to buy a compatible tn 660 toner and that will generally cost you less than the standard tn 630 toner from brother.
Again save over 50% on your cartridge costs by using compatible cartridges not OEM which are just too expensive.