Parity in the sentencing of similar offenders who have committed similar offences is a recognized principle of sentencing:  Criminal Code s. 718.2(b): R v Hawley, 2015 ONCA 143 at para 8

Over time, the operation of the parity principle gives rise to ranges of sentences for similar offences committed by similar offenders. However, there will always be situations that call for a sentence outside a particular range, in light of   the fact that each crime is committed in unique circumstances by an offender with a unique profile cannot be disregarded: R v Hawley, 2015 ONCA 143 at para 8