Try hitting balls at different angles you get different sounds.
But if you used a consistent tool (mallet) at the exact same angle , with the exact same force it would always be under the same conditions and each bat would generate slightly different sounds?
Got a very good point there though Tim , can't quite think of any way to explain that through this theory

. Guess we just have to consider what makes the different sounds between the laver and the newbery, which I assume would just come down to pressing.
Edit : I'm taking your word on a laver sounding different to a newbery by the way , I don't have a laver to test my newbery against

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