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…. (Aisin says their Aisin WS is the exact same. I spoke with their technical dept)…..
Due respect to the Aisin "technical dept", after seeing a similar claim on Amazon for Aisin Honda DW1, call me skeptical. The claim there is Aisin DW1 is Honda OEM , VOAs have proven that to be false. Not saying it's not perfectly fine to use in WS applications, however until and unless there are VOAs posted for both, personally I would not assume they are identical.
To question, seeing the price of ST equivalent linked, if accurate and I was considering using it MaxLife would be the obvious choice for me.