No, people(other Aro experts, some work @ farms) I've talked to said Banjar Red is G2 Red=G1.5 Red. G1.5 is just another market gimmick. Grade 1 Red is a Super Red (Scleropages legendrei).
I've visited farm Indonesia and Singapore and directly talk to peoples that works there. G1 red are those that are higher quality. G2 red are those only to turn yellow or orange. The "1.5" is due to that fish whole body of a green aro a half red which refers to the fins. Meaning the "1" is green and ".5" is red. That is why it's called the 1.5 red. The number 1.5 is not a grade. Talk to some people directly face to face in Asia. It will give you more info than typing words online. Also offer them cigarettes. They love smoking while talking.