@User, thank you for the explanation. I see 2 problems here: 1. extracted stdcells have the same name as original stdcell spice netlists. 2. port order is different Is there an option in the extraction process of Magic to change or add a prefix to differentiate? @User From your description simulation should be either on full schematic netlist or on full extracted netlist, mixed (some parts extracted from layout, some other parts from schematic) does not work, without some corrective actions. Just for testing may be you can change with an editor the

sky130_fd_sc_hd__

prefix in the extracted netlist to something different, like

sky130_sc_extracted__