I would say their skating is very comparable at the same age. Yes Catton's a more willing shooter but we'll see if that continues at the pro level and of course there is no exact comparable for two players. I saw Granlund play in-person several times when he was 16. Their offensive instincts and playmaking are very similar but I might give the edge to Granlund at the same age as his vision and IQ were elite in his draft year. I also see them having many of the same limitations.
Granlund has had a solid career (he's still producing on a terrible Sharks team) and Catton will defy the odds if he has a better career than Granlund. That's the reality of a player who is going to get drafted in Catton's range. I see Catton on the wing in the NHL where I think he could be more productive and valuable to his team.
I have no issues calling Granlund one of the most creative draft prospects in recent memory, he was an absolute wizard, but he definitley had question marks regarding his skating (similar to Cauflield). Catton's a clear notch or two ahead in the skating department.
I've said this before, but what amazes me most with Catton is his polish. Not only is he a 5-tool offensive player, but he pieces together those tools seamlessly and with such efficiency that is almost never seen in a draft eligible player. He is in perfect control at all times with the puck.
Does he have anything like Tim Stutzle and Jack Hughes' elite skating or Patrick Kane's GOAT hands that raises their ceilings to potential Art Ross winners? Probably not.
But I'll stick my neck out and state that I think in his prime, Catton's floor is 70 points. That might sound unrealistic, but I can't fathom how he is not at least that level of offensive player.