All Mantis have the same bodies and you can bend and pose the legs around, but the heads are different and the Assassin's front claws are different. Here's the thing... These guys are big, really Big! Here are some shots to compare:
Mantis Assassin w/ a 15mm Earth Force
Mantis Assassin w/ a 28mm SWAT Sniper
Mantis Assassin w/ a Titan HAMR Suit.
We have some more stuff coming out, so stay tuned!