The parity principle does not require identical sentences for co-offenders where one offender's objective criminality is materially broader than the other's, involving additional counts and separate sources of criminal conduct beyond the shared enterprise. Differences in the percentage discount for subjective features, reflecting different levels of cooperation and assistance, further justify sentencing differentiation. A failure to structure sentences in accordance with Pearce v The Queen does not warrant resentencing where the total effective sentence is otherwise appropriate.
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