Determinable randomness, indeterminable certainty?

Question

It is my understanding that there are two types of random number generation used in computer science. True random number generators that use principles of a physical property to determine their generation and pseudo random generators that use algorithms based upon mathematics such as chaos theory. True random number generators use a proposed indeterminate properties of the physical world because of the principle of uncertainty and pseudo random number generators employ chaos theory which are non linear deterministic equations whose outcomes are sensitive to initial conditions however they are deterministic and with the same initial conditions the outcome will be the same. My question is the principle in true random numbers generators and the principle of using chaos theory in pseudo random number generators the sane, as both principles use a deterministic factor the schrodinger equation in true random number generators and deterministic equations of chaos in pseudo random number generator,so what's the difference? Is randomness actually certainty? or vice versa?