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They look pretty different to me, but that is an interesting fact. It also seems that humans are a lot more sensitive to it than rats are.

In the wiki article, the section on synthesis describes how it’s made from lidocaine as starting point. Another name for it is actually “lidocaine benzylbenzoate”.

If you take a look again at the diagrams, you’ll notice that it’s almost exactly the same, except one of the N now has a benzene ring attached to it.

Pretty interesting too that lidocaine is pretty bitter too, though presumably nowhere near as powerful as bitrex.

I'm no chemist but the pictures on Wikipedia look nothing alike.