"Surówka" is a salad that is made only of fruits or vegetables which are not processed. You don't boil or fry them for example. "Surowy" means "raw". "Sałatka" is a salad that is made of fruits and vegetables which can be processed and contains some extra ingredients (e.g. meat, pasta, mayo). "Sałatka" can be considered as a separate dish, but "surówka" is more a side dish. Hope this helps.

Not exactly , sałatka might be with meat and cooked vegetables , but surówka is using mostly for name dinner salad and is made with raw or pickled vegetables .