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1920 Buffalo cuds. Do I have a die progression here?

As far as I know, there are 4 different examples of these major cuds. Is it possible that 1,2, and 3 are different stages of the same die? I have previously been told that the fourth coin is not. If anyone here has an example of #4 I would be interested in acquiring it. Thanks in advance.
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I would say no. None are struck from the same die.