This is interesting.
We already know W231 and HP38 are the same "exact" powder being put into different bottles.
I am not sure if Ramshot Zip is the same "exact" powder, but according to burn rate chart, comes close enough to be a direct replacement powder in my eyes. I found Zip costs comparable to W231 but more than HP38.
As to OP Green Dot, the burn rate chart shows it to be a bit faster burning powder than W231/HP38 but slower than Bullseye. The load data charts show it to take very similar charges to W231/HP38. And Green Dot costs about $35-$40 less than W231/HP38 for 8 lb jug.
I currently have Bullseye, W231 and HP38 in 8 lb jugs. If a new reloader wanted to load for short barreled compact/subcompacts (2"-4") and full size (4.5"-5") pistols but wanted only one powder, Green Dot would be a great cost effective option.