It's been said many times, but they're not really similar riders; in fact, it's like saying CX & XCO are the same; they seem similar, but they're quite different.
Wout is a road rider, on a World Tour team, who rides CX in the winter. He can climb, sprint and TT, which is out of the ordinary, really. Nobody else can do that.
However, MvdP is a multi discipline cyclist, who will race MTB, CX and Road, and is world class at all 3 - whether he can do what Wout can do is pointless - he's shown no interest in doing that. He has different priorities. For the last 4 years, his main aim is next week; the Olympic MTB race.
He's also meant to be aiming for Paris 2024, so will be on the MTB until then - which seems to have annoyed some people, wishing he'd move to the Road full time. One hopes he can win a MTB World title, to add to his CX titles.