No. I think you're right. He's a completely different type of player than Attouchu.
Attouchu was a quick, explosive guy who could bend and get around players primarily with a speed rush, although he could use his hands and a spin move to get inside as well.
I think Merriweather could well be a very good player but he already shows the build of someone destined to be an interior player, IMO. Big, strong, decent burst, and smart is not usually a bad combination. Now if he also has mean to add into that mixture, he could have the makings of a really good one.