I think another great example of this is turbochargers. One of the biggest issues when Chinese companies started making counterfeit turbos is that they physically looked the same/identical. It turns out though, when a Cummins/Holset turbo failed, it was in a controlled manner. When the Chinese knock-offs failed, you were probably replacing an engine block, and potentially could kill someone.

https://www.youtube.com/watch?v=Za0DieZHMKc