Same species as far as I know. The reading I did on them indicated green barbs are more tolerant to cool water than your standard TB. I may be wrong on that.Freshy, TBs are the same species as green barbs (TBs?), right?, Just a color difference, aren't they? Or am I missing something?
When I was down to one large green barb, he/she was such a nuisance in that tank, I had to net him out and plop him in with my oscar and green severum. He lived happily in there for a year or two until I found him dried out on the floor behind the tank one day.