It has been said that in some cases manufacturers are replacing the faulty units with the same make and type to mitigate the immediate risk. The ACCC make mention of this in their FAQ's on the Takata recall;
https://www.productsafety.gov.au/news/faqs-on-takata-airbag-recalls#some-airbags-are-being-replaced-by-the-same-types-of-airbag-i-m-concerned-about-the-safety-of-my-replacement-airbags-as-i-ve-heard-they-may-degrade-over-time-