KB: Compare netlist generated from schematic to that transferred to PCB layout

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Altium synchronizes schematic data with the PCB layout behind the scenes as a unified environment, so there is no exchange of intermediate text files.  Since the ECO does a direct project to PCB compare, there is no native Altium netlist format per se:

https://resources.altium.com/p/understanding-your-pcb-netlist

There is a command to export the netlist from schematics as a text file from Design » Netlist for Project» and from the PCB side, Design » Netlist » Create Netlist From Connected Copper', but unfortunately, the two do not follow the same format/syntax/order.

Instead, to compare the data between the project (schematics) and a PcbDoc contained directly, invoke Project » Show Differences..., select the PcbDoc, and click OK.

https://www.altium.com/documentation/altium-designer/keeping-schematics-pcb-synchronized#!finding-differences

You can also compare two different projects/documents by ticking Advanced Mode at the bottom of the dialog.
https://www.altium.com/documentation/altium-designer/keeping-schematics-pcb-synchronized#!displaying-physical-differences