At first glance, the structure on the right looked Marble King to me. I don't have blue-based MK cats though. I do have blue-based Vitros, but with a cage style cat.
Fwiw, the modern Marble King cats could go a little crazy structurally.
I am considering that #2 through 5 (left to right) could all be American-made cats from the same manufacturer, even though #3 obviously doesn't care about fitting in.
And a different maker for the larger marble, #1.