They also both seem to be made in ancient times by humans, and the fact they function on mysterious energies driven by loreconvenience.I just find it hilarious that a spinner is the version exclusive counterpart to a spinblocker. But that's on the competitive side of things (Also PU Claydol when), and the version exclusivity mainly comes from the fact that they come from a similar source in terms of origins (Hebrew mythology). Otherwise 0 similarities aside from Ground typing (Claydol has a 27~ BST difference from Golurk, evolves earlier, has a far different stat arrangement etc.). But this has happened before. (Remember when Houndoom and Mightyena were version exclusives back in BW1? Good times.....)
Claydol: Claydol are said to be dolls of mud made by primitive humans and brought to life by exposure to a mysterious ray. This Pokémon moves about while levitating. (Ruby entry)
Golurk: Golurk were created to protect people and Pokémon. They run on a mysterious energy. (Black2/White2 entry)