I've noticed that all Happy Valley parks are similar in themes except for Beijing. Beijing seems to be focusing on ancient cultures. For example: Atlantis, Wild Fjord (which is more like nature), Lost Maya, Aegean Harbour, Shangri-La. Ant Kingdom might be the only exception. The only same land Beijing has with the others is Shangri-La (Shanghai will also have an Ant Kingdom, but the artistic rendition shows a more modern and colourful version of it).
Chengdu and Shanghai are more based on the original park, Happy Valley Shenzhen. All three have an entrance plaza, Spanish Square for Shenzhen, and Sunshine Plaza for Chengdu and Shanghai. Both Shenzhen and Chengdu have Magic Castle, and they both have a water park (Playa Maya Water Park for Shenzhen, and Caribbean Storm for Chengdu). Both Shenzhen and Shanghai have Gold Mine Town and Typhoon Bay. All three have Happy Time.
Additionally, Chengdu and Shanghai both have a land themed to local cultures. Chengdu has 巴蜀迷情, which means Bashu Nostalgia or something like that (Bashu is like an ethnic group living in Sichuan region). Shanghai has 上海滩, which is The Bund.
I've also noticed that the two newer Happy Valley parks kind of have the Islands of Adventure layout, which is a giant lake in the middle and rides surrounding it. Although for Chengdu's case, it's more like a lake with a giant island in the middle, and for Shanghai, there's actually another river that separates The Bund section with the rest of the park.
LOL, I think I said too much way too much.