There is no way to tell now, sorry.
Blue dream Sativa dominate so thin skinny leaves I would say are the dreams. The kush is the tall one I would say imho. Feed them the same she will tell you if she needs more, imho… that dream will stretch big time when it’s time.
Both sound pieces of advice given above.
It is impossible to tell cannabis genetics apart by look, the closes you will get is watching for sativa or indica traits but even then it’s not a sure thing.
You should always read your plant and follow a feed scedule.
Nides are further apart on sativas generally and leafs are skinnier but heat and lack of light can cause node spacing to increase.