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Theory: Fauna is actually Mori from an alternate timeline where she got interested in ASMR instead of rap.
Evidence for: Both have a bias in interest of cute and funny (Gura), both have a passion for their specialty (Mori, music; Fauna, ASMR) to the point of autism but also have an interest in studying each other's specialty (Mori is interested in making ASMR while Fauna is doing her singing lesson reps), both are close to their family and talk about them often, both are the player of games to the point of autism (Mori, Jump King; Fauna, Getting Over It), both suffer from senpai autism. Watame seems to have a huge interest in both. They both own two cats. Both have big tits. Both of their debut streams showed off their specialties near the end. Both have talked about the bimbofication of Pyramid Head.
Evidence against: Mori is a full blown meat eater while Fauna is vegan, Fauna love swimsuit while Mori shows general apathy at showing more skin, Mori is fucking loud and a bit of an edgelord while Fauna is a lot more quieter. Deadbeats often shit on Mori, while saplings cry about missing Fauna. Mori makes monkey noises when she gets frustrated, Fauna screeches like a girly girl.
Conclusion: Not enough evidence to make a conclusion. Must listen to a collab ASMR, preferably with ear licking, to reach a consensus.