There are currently no subspecies of blue and golds, but there seem to be populations that differ from the "normal." Joanne Abramson's "The Large Macaws" points out some birds with orange rather than yellow/gold breast tones, and some that have a more metallic or aquamarine blue. I've met some with green tones at the bottom of the black beard and some called "indigos" with very dark primaries. Some claim that Bolivian blue and golds are giants, but few really know the origins of their breeding pairs. It's a marketing tactic, mainly.
I don't see any hybrid characteristics in the pics so far.