They were a separate order from the Regional Railways fleet, modifications were specified by Thailand Railways from the get-go. They weren't diverted from the BR order. The Siemens stock are broadly similar to the GB 360s but again were never planned to be sent here. They were just a follow-on from the British order. Both Desiro fleets were indeed built in Krefeld, Germany.
The get-go? What's wrong with start?
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Astonishing that the country that invented railways has to import them from Canada, the U.S., Germany, Spain, Japan. It's almost laughable if it wasn't so tragic.