There are some slight differences actually. They look very much the same but they do have varying differences.
Like I swapped he SS Flash Body with the SS Magneto body, and it wasn't just the arms that were different. The only thing they share were the abs and pelvis. The legs, chest and arms were all bigger on the Magneto body.
- They have the shorter slim that's been used on Luke Skywalker and Darth Maul
- The have the taller slim that has the accordian/centipede torso that's been used on Daredevil, Joker V2, Ghost Rider, Mythos Boba Fett.
- There's there's the slighter bulkier body that's on Flash and Red Skull. This is also the same one used on Nathan Drake, Indiana Jones and V2 Mythos Obiwan, but these have medium sculped muscle arms (like TTM19 size)
- Then you have the biggest body like on Superman V2, Batman V2, Thor and Magneto. Cyclops shares this body but has smaller double jointed arms, which is the same body as Captain America but Cap doesn't have the chest piece.