Why different ?
It's Polymerized Chemical Toner
Not Just Chemical Toner
Canon : LaserShot LBP5200, LBP5200n
Replacement Toner for : 9290A003AA, 9289A003AA, 9288A003AA, 9287A003AA, 9286A003AA, 9285A003AA, 9284A003AA
Replacement Drum for : 9623A004AA
Polymerized Toner: New generation toner, chemically polymerized, toner grain is very fine and uniform in size which makes big difference in color quality.
Pulverized Toner: Conventional toner, mechanically pulverized.