PT908-89160-02 is basically the same thing, they just don't have the TRD Pro on them and they are little different tread pattern. I scored a brand new set on Facebook marketplace for $65.
So, basically, it’s totally different
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How so? If they're the same material, thickness, fastening system then it's as OP said. Just a different graphic and TRD PRO text. A brilliant marketing gimmick