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You could use an inbound service policy to mark your two VLANs differently, or you could use an outbound service policy to mark your two subnets differently. (NB, reason I used VLAN for ingress and subnet for egress I'm assuming the router has a subinterface per VLAN, but egress likely merges the two sets of traffic which would then require matching on source subnet.)
PS:
You could also use the an egress policy to treat the two sets of traffic differently (NB: may not require actual traffic marking).
