Run report_incremental_reuse to examine and report the similarity between a reference design checkpoint file and the current design. The report_incremental_reuse command compares the netlist from the reference design checkpoint with the current in-memory design, and reports the percentage of matching of cells, nets, and ports.
A higher degree of design similarity results in more effective reuse of placement and routing from the reference design. The greater the percentage of similarity between the reference design and current design, the greater the opportunity for placement and routing reuse.