Hi, mind if I asked which farm you got it from?
And to my knowledge, Batik / Nami are the same thing, different names coming from different places. Batik being more well known, and Nami being the Malay name.
It's likely that the scleropages on the shore of Andaman sea will have a pattern of line up from the cheek to scale.
Nami Juv get greenish tail. The batik will be more yellowish.
By their skull shape of most fish I've seen on markets. Nami look like they are cross breed of some green (with high Filial) with a wild S. inscriptus and they did it before the batik got sci-name (wild caught and lower filial tend to look more wrathful)
Personal experienced and opinion after searched for my first aro.