Yes, there is. Overall the head shape between the two is different. It is like looking at a Pitbull and a Great Dane.
You can simply use the book "Complete Ball Python" or an even better choice would be the book "Pythons of the World, Vol II: BALL PYTHONS" which will show diagrams on head scale pattern size and count between a few species.

Regars,
Anthony Wrenn
Link

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-AnthillPython.com-