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Differences in lighting are interesting to me, in part because it's usually legislation that dictates the changes. The two attached pictures show an Insignia doing a moose test with its brake lights illuminated, and the other is showing a Chinese Regal with brake, tail, reverse, and turn signal lights all on. US cars have combination brake/turn lights on the rear that are red. This is likely because the area of the brake lamp is insufficient to meet US regulations. And I would have to agree, the Euro brake lamps look way too small.
Also, FWIW, Euro cars don't have the amber side indicator on the bumper.
If you have an hour, the Autogefühl introducing the 2017 Opel Insiginia has an interview with a couple of the Opel designers who discuss the styling elements from the Manta concept that made it into the Insignia (a.k.a., Regal).