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The factory filter is a Wix. The Motorcraft is a P1.
Ford does this in case someone makes a warranty claim that can help prove whether the owner ever changed the oil.
I suppose that could be one explanation. IMO, the more likely explanation is there's two separate contracts that go out on bid. The assembly line FF being one and the off the shelf OES Motorcraft filter the other.
As for who's making the FoMoCo FF now, most recent anecdotes posted look to be Wix made. However, looking at the topic baseplate on this one, to me it looks to be a Champ Labs filter. It has the metal wrap around and over the top the baseplate diameter, glue used in that seam. Never seen that design on a Wix made filter.
While Motorcraft like P1 made by Purolator, construction and likely efficiency not the same. Most notably, MC uses a thread end bypass.