The Games Workshop Rapid-fire Battle Cannon and the Dreamforge Beowulf Artillery Cannon are just one striking example!
However - all that aside - this picture will tell you that though they share certain things that are similar - height is not one of them!
Dreamforge Leviathan Crusader for the win... even without the epic weapons loadout.
It's one of my Kroot Eldar pirates with his paint scheme nearly done!