It's probably not, either a wrong scan or rebacked or something.
But, never say never.
One of the 150 only cards has a single known example with a P350 back.
I have a thought that Piedmont needed so many cards that occasionally a handful of sheets intended for other series were used up to fill minor shortfalls in a Piedmont shipment.
More common, are cards that appear to be rebacked with a paper layer of a different brand. Possibly also as a fill in or using up finished sheets that ended up as overstock.
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