Are non-rebreathing systems the same!?

The first non-rebreathing circuits became from the early 20th century. A dozen circuits were designed, between the 1920s and 1980s, with different designs, but all of them trying to “deliver the best cost-benefit ratio”. In general, everyone follows the idea of ​​providing anaesthetic, O2 and avoiding CO2 rebreathing. Here comes the question... But, are they all the same or not?