OpenRCX versus Magic parasitic extraction on the same sky130 block agreed only under one accounting scope, all-records ratio 1.206 FAIL, wire-only 0.791 FAIL, SPEF-scope 0.996 PASS, and the setup WNS delta of 0.208 ns failed the 0.10 ns tolerance, with the whole gap traced to how the SPEF was built rather than extraction.