The only difference is that tornado is (air-based phenomenon) while whirlwind is (earth-based phenomenon)[1].
Also the extension tornado.cash while whirlwind.money
Another mixer which has some sort of correlation before Blender.io = Sinbad.io | Thoughts? Also the extension tornado.cash while whirlwind.money
But it's still a conspiracy and even it's already proven they have a connection, there's nothing to worry. AFAIK Blender.io and Tornado.cash had never scammed any user from their mixing service.
Maybe in the future if whirlwind.money get shutdown by SEC, they will start with another names like hurricane.fiat, typhoon.capital, cyclone.funds
