Lignin, a bio-based aromatic polymer and the main natural source of phenolic compounds has recently gained interest as a sustainable alternative to petrochemical-derived bitumen in asphalt mixtures. Most previous studies have focused on the wet incorporation of lignin into binders, often overlooking the influence of lignin type. This study investigates the dry incorporation of four technical lignins—two kraft lignins (KA, KB) and two lignosulfonates (LSA, LSB)—as filler replacement in asphalt mixtures. The lignins were characterized in terms of molecular weight, polydispersity, elemental composition, functional groups, and thermal properties. Binder content, particle size distribution, penetration, and softening point were measured on mixtures and recovered binders. Results show that lignin preferentially migrates into the bituminous phase rather than remaining in the filler fraction. The extent of this migration depends on lignin morphology, molecular weight distribution, and sulfur content, which affect its interaction with bitumen. These findings underline the importance of lignin type for asphalt applications.