“I do see a similarity as to the shape of the arm between the two, in terms of bicep shape, tricep shape, height and depth, and the shoulder muscle looks the same between the two as well.”
The similar odd pose that BOTH Barry and FMD are holding seems somewhat unusual to me as well.
I don’t think they look alike on the face, but their body build is similar.
Facially-wise, since until anything is confirmed, he looks most like his supposed grandfather.