They are the same toner however the option ending in X is the high yield toner with up to 12500 pages.
HP 952XL has a shelf like of 36 months, and a yield of 1,600 pages.
The HP CE278D Toner is a 2 pack of the HP 78 A Black Original LaserJet Toner Cartridges and contains two (2) of the HP 78 A Toner Cartridges. HP CE278A contains a single (1) Toner Cartridge.
The HEWCF230A (CF230A) Black Original Cartridge yield is 1600 pages.
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