The Head shapes are different and need a different rubber to seal them correctly. Priming ensures that ink is flowing all the way through the printhead nozzles. HP Deskjet 1000 / 1010 / 1050 / 1050A All-in-One / 1510 / 1512 / 1514 / 2050 / 2050A / 2050s / 2510 / 2540 / 2542 / 2544 / 3000 / 3050 / 3050A e-All-in-One / 3055A e-All-in-One.
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