What is the (physical distinguishing) difference between a Cook's Tree Boa and an...

...Amazon Tree Boa? My friend and I are looking at different tree boas and we are wondering if there are any physical distinguishing traits that Cook's Tree Boas carry that Amazons don't, aside from color. The reason we're excluding color is because different morphs can produce different color strains, and we are hoping for some way to tell the difference by looking at them. We have compared pictures and as far as we can see from the photos, they look the same and are indistinguishable.
Thanks! :)
 
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