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What you ought to do is follow Dortania's guide and stay away from OCC; latter's been known to corrupt OC config. Of course, you should re-use the SMBIOS values from your previous build, that's actually the clever thing to do for very obvious reasons! An alternative to GenSMBIOS tool is to use Clover Configurator to generate the data.

You may also use Clover Configurator and its SMBIOS + RtVariables tabs to generate your SMBIOS data. Or OpenCore Configurator too.