One way in which emperor meiji, kemal atatürk, and shah reza pahlavi are similar is that each supported a policy of

They all supported a policy of westernization.

Prior to these rulers, Japan, Turkey, and Iran used to be very isolated and not have a lot of contact with their neighboring countries, let alone the West. However, once Emperor Meiji, Kemal Ataturk, and Shah Reza Pahlavi assumed the 'throne' of their respective countries, they turned towards the West and wanted to modernize their countries and people.