What is the difference between a CEQA and a judicial review of an EIR?

"Judicial review of these two types of error differs significantly: While we determine de novo whether the agency has employed the correct procedures, 'scrupulously enforc[ing] all legislatively mandated CEQA requirements' (Citizens of Goleta Valley v. Board of Supervisors (1990) 52 Cal.3d 553, 564 [(Goleta II )]), we accord greater deference to the agency's substantive factual conclusions. In reviewing for substantial evidence, the reviewing court 'may not set aside an agency's approval of an EIR on the ground that an opposite conclusion would have been equally or more reasonable,' for, on factual questions, our task 'is not to weigh conflicting evidence and

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