Dynamic light scattering (DLS) and small-angle neutron scattering (SANS) correlation radii, xi and xi(SANS) are reported for polystyrene (PS)/acetone-h(6) (ACh) (DLS) and PS/ACd (DLS and SANS) solutions at near-critical concentration for (7.5 x 10(3) less than or equal to M-w/amu less than or equal to 25 x 10(3)), (0 less than or equal to P/MPa < 120) and (12 less than or equal to t/degrees C less than or equal to 91), during pressure and temperature quenches ending at or near precipitation. The data are well described in the (T,P)(psi cr) projection using the multidimensional reduced scaling formalism introduced previously. The analysis yields scaling exponents (nu similar to nu(SANS) = 0.65 +/- 0.06) which are in agreement with the theoretical value, nu(TH) = 0.63, but (xi)degrees and xi(SANS) are offset from each other, ((xi)degrees/xi(SANS)) similar to 3 The superscript "o" refers to correlation radii calculated from monomodal DLS correlograms using the Stokes-Einstein relation, (xi)degrees = k(B)T/(6 pi eta(o)D). D is the DLS diffusion coefficient, and eta(o), is the pure solvent viscosity. For PS/cyclohexane (CH) and PS/methylcyclohexane (MCH) solutions, (xi(o)/xi(SANS)) similar to 7 and similar to 20, but for all three solvents, agreement improves when eta(o) is replaced withy, the solution viscosity. Then, (xi/xi(SANS)) similar to 0.3, similar to 0.2, and similar to 3 for PS/AC, PS/CH, and PS/MCH, respectively. The results indicate the two probes are responding to the same or closely related clustering phenomena.