Yes, Pileateds are not particularly rare, and one has to assume that these purported sightings of Ivory-billed are just misidentifications by people who WANT to see the extinct one, or don’t even know the common one exists.
That would be my guess, as well. From underneath and in motion it might be difficult to discern the two. Really would need to see from above or a side view, but if they are in the tree tops, that would be hard to see.