I don't know head scale nomenclature. I see a great deal of variability in it though. The carapace scute coloration seems to be the most consistent trait. The mild orange colored head on one of them is a really nice color. I have more watching to do.
The main thing about the head patterns is the almost complete covering of 'color' on virtually everyone of the Bolivian locale - especially in the much older "mature" specimens. Compare with other locales.. North of the Amazon in particular.. some of those are almost melanistic!
Others from the few acquired earlier this summer -
Note the plastron on this very young one -