utricularia, if that's what you're thinking about, is another type of carnivorous plant that uses a vacuum-based trap to catch small prey. It is not the same as aldrovanda because aldrovanda uses a snap-trap system like VFTs to catch their prey. For the last 2 questions, the answers depends on the species. Im not a utricularia expert nor an aldrovanda expert but I do know that there are 3 types of utricularia, aquatic, epiphytic and terrestrial. Obviously, aquatic utricularia are found in 100% water habitats so in that case, then yes, uticularia can grow without soil. If you were wondering, some people grow terrestrial utricularia in two containers, where the top container is full of peat and the bottom container is full of water, which will allow the roots to grow deeper than the top container and be able to display its roots as well as the traps. Personally, and also due to my lack of knowledge towards utricularia, i dont see the difference between terrestrial utricularia and aquatic utricularia if it is possible to grow terrestrial utricularia in containers with only water, however there might be some differences between leaves and traps to accommodate the less watery enviroment. Personally, I also think that utricularia looks messier than aldrovanda.
If your hoping to grow these plants then good luck