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Hi [USER=695306]@cookies1427[/USER] ,

Different manufacturers have different rules for pin/label layer definitions. The easiest way to figure that out is to take any standard cell (for example, from the digital library, let's say, an inverter), place it into the layout and check which layer is used for the pin/label. You can do so by filtering "only used" layers and turning on/off the corresponding metal.

Hopefully, that helps.