That's a pretty good comparison. I think Patrick is the better skater and shooter at this point in their careers, but without the same feel for the game and defensive awareness Sam had - what Sam was able to do in the dub with his mediocre level of athleticism was astonishing.
I like the poor man's Tavares comparison. He's pretty nifty around the net, has a quick, accurate release, and is able to find guys in the slot from the half wall to behind the net. He's not quite as sneaky as JT was at the same age, and he doesn't have those magical mittens, but he does a good job finding space in high probability rebound areas and finishing with authority.
As a projected 1OA, I'd say he's mildly below average. Here's where I rank him in terms of hype / expectations coming into his draft year vs previous forwards taken 1OA:
Crosby
McDavid
Tavares
Matthews
Ekblad
Mackinnon
Stamkos
Patrick
Hall
Yakupov
RNH
Kane