Both trucks operate on the same principles, look the same, use the same fuel, about the same size, same speed, same materials to build.
But, just try and put a Chevy starter on a ford and give it a key turn.
Same goes with human and simian
I was excoriated and pointed to the obvious overwhelming evidence of this weeks version of Darwinian theory.
Excellent analogy, I'll have to remember it some time.