Similar to Sumer, it appears. Wouldn't surprise me if they find evidence showing both had the same benefactor(s).
LOL. I just completed reading the book, Voyages Of The Pyramid Builders, by Dr Robert Scoch, that's exactly the theme of this book. He speculates that all the world's pyramid builders came from the Sunda Shelf (around present Indonesia) as the shelf went underwater at the end of the last Ice Age. I found out from this book that the world's second oldest bronze metal working site is in Thailand.