Combustion engines haven't changed that much in the last 50 years, and most brands use similar designs. Rolls-Royce and Bentley have been using the same engine

Combustion engines haven't changed that much in the last 50 years, and most brands use similar designs. Rolls-Royce and Bentley have been using the same engine design for ages (https://en.wikipedia.org/wiki/Rolls-Royce–Bentley_L-series_V8_engine https://en.wikipedia.org/wiki/Rolls-Royce–Bentley_L-series_V...). Differentiation is not on one part.