Well, there's a difference between "similar" and "identical".
If I were to pull out other similar ones, though:
* Renji's zanpakuto turns his weapon into a giant monster which attacks people. This is quite similar to Mayuri's (although Mayuri's differs in spreading poison instead of itself) and Werewolf's (although Werewolf's heals naturally and shares injury with him).
* Gin's poison dust is similar to both Matsumoto's murderous ashes, in that both weapons dissolve, turn into dust, and then kill enemies from the inside.
* Hinamori and Kensei apparently both use their shikais to gather spiritual energy and fire it as bolts of power.
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