Specifics of agglomerate densificationimportant for hot pressing, conventional, and spark plasma sintering of powdersare analyzed based on the biporous material modeling framework. Numerical simulations are utilized to determine what technological parameters can be used to improve the postprocessing homogeneity of agglomerated powder-based materials. The modeling results indicate that the homogenization during sintering and hot pressing of agglomerated nano- and micrometer-size powders is significantly impacted by the viscosity of grain-boundary sliding and by the possible existence of high-intensity diffusion paths along the agglomerate boundaries.