Shirvallah is a different loa. While Kimbul is a male tiger who is worshiped by the Zandalari, Shirvallah is a female tiger worshiped by the Gurubashi trolls in Stranglethorn. High Priest Thekal was her high priest in the original Zul'Gurub raid in WoW. Here is more info.
Adding to the confusion is that Blizz was a bit lazy here and used Kimbul's art (you can clearly see his scars and missing eye) for Shirvallah instead of making a new one.
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