If two identical objects, such as two identical quarks, were to occupy the exact same quantum state, it would indeed violate the Pauli exclusion principle. The Pauli exclusion principle states that no two identical fermions (particles with half-integer spin, such as quarks) can occupy the same quantum state simultaneously.
In the case of quarks, they are fermions and follow the Pauli exclusion principle. Quarks have additional quantum numbers called color charges (red, green, and blue) in quantum chromodynamics (QCD), which is the theory describing the strong nuclear force. The combination of quarks within a proton, for example, is subject to certain rules dictated by color charge and other quantum numbers.
If two up quarks of the same color and a down quark were to occupy the same quantum state within a proton, it would violate the Pauli exclusion principle and result in an invalid configuration. This violation would imply that the state being considered is not physically possible according to our current understanding of quantum mechanics and QCD.
In reality, the Pauli exclusion principle ensures that the quarks in a proton (or any other baryon) occupy distinct quantum states with different combinations of color charges, spin, and other quantum numbers. The specific combinations of quarks and their quantum numbers determine the properties of the particle, such as its charge, mass, and stability.