Emersed flowers won't tell us the difference. It's a variety, not a different species.
It's unfortunately, a case of majority rules as to whether there is a difference unless we had gone to Araguaia and collected it ourselves and taken pictures to prove that is where it came from.
mrkookm's pictures are the real deal and do look different from what we seem to have now as 'Araguaia'.
I'm keeping this one and one I know to be 'Cuba' in the same tank and I can say they are different, but maybe not different enough. It's quite possibly yet another variety that is even less stark in contrast.
For the sake of the hobby it's likely best to just sell them all as 'Cuba' as the similarities are so many and the differences so minute.
In the D.C., Maryland, or NOVA area? Come check out The Greater Washington Aquatic Plants Association! www.gwapa.org