True blues, moonbeams, leopards , garo, emerald etc. all are defiantly the same species and more closley related to eachother then other stewertii.
They are just diffrent localities and all the localities are fairly close to eachother so I'm sure their are overlaps between them and I'm sure their are lots of true blues that look like the others and the other way around . What name they get has more to do with what hillside they came off of/who collected them then what they look like as the differences are cery subtle.
I can catch brook trout from my 2 favorite spots that look diffrent in spotting and the streams are only a 30 min drive apart from eachother. They are both brook trout but fish in one stream more often then not have much larger blotchy color spots while the other is the more typical small round spots of colors. In Both streams you'll get fish somewhere in between or that look like the others because they are after all the same fish but because the populations are in diffrent streams that don't cross one bloodline is expressing slightly diffrent set of traits then the other.
No diffrent then selective breeding in tanks,(not common with channa , buy think cichlids or aro's etc) if you wanted to breed a trait out in a species you choose similar parents to express a particular gene but some of offspring will still show the other traits/apearances that are still present in the bloodline but the highest percentage of offspring will display the trait you dejected for.
In the wild natural selection limits the bloodlines and localities form.
Hope that helps!