Are opel astra parts the same as vauxhall astras?

Yes, Opel Astra and Vauxhall Astra parts are largely interchangeable, as both brands are part of the same automotive group, Stellantis. They share the same platform and components, although some specific parts may have different branding or minor design variations. It's always best to check compatibility for particular parts, especially if they are model-specific or region-specific.