I'll agree and disagree with you. You are right, there are a lot of parts/materials sourced from the same suppliers that are not the same. Same basic design, but different thicknesses etc. like your wiring example.
Then there are parts that are sourced are identical, and are interchangable. One OEM may fail a part while the other may not based on the application of where the part is at, the loads and stresses it sees.
I have designed robotic assembly cells for all of the vehicle manufacturers (domestic and foreign) and you would be amazed how strikingly similar the parts are. Then you would probably be just as surprised how many different ways the same "widget" is designed.
I then designed these same parts, now I test these designs. Some parts have very minor tweeks based on an OEM spec that the other OEM doesnt call out on a print.
That minor tweek, or the same part in two different applications can make a world of difference in the outcome.
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