IMO, I feel most Bowens are smaller than Koto's. Some more than others depending on the phase. X-Men Beast is one of the few that match up nicely w/o risers. Great piece.
Cyclops is more wide than anything, his base takes up some space.
They all go together nicely, it's just how you display them.
Aside from 2 sideshows, the rest are Bowen and koto, and 1 NECA.
If it's undersized just use wood or acrylic risers. I prefer wood.