Often time a node on the schematic will not have a recognizable name attached, but clicking on a wire on the schematic in order to load it into VIva may highlight the wire in (say) dark blue.
The trace in Viva will appear in (again, say) red. Why cannot the highlighted wire colors in the schematic MATCH those in Viva? Then looking at schematic and Viva together it is clear which trace maps to which wire.
Once one has a half dozen wire colors in the schematic and a half dozen random trace colors in Viva, it is not easy to one-to-one map them.