I read that's not really the case - there's a bunch of equipment on EU-spec (and some other market) BYDs that comes from EU vendors such as Bosch. It additionally has a completely different AC unit as the kind of refrigerant BYD uses in China is illegal in the EU.
I'm not saying it justifies the price difference, but there are changes between the cars.
The BYDs exported to Europe are made in Thailand.
So no, they are the Euro spec car.