1. A method comprising: receiving at least sequential current and subsequent sheets of a print job, each sheet including a front image and a back image; and scheduling the received sheets to be printed with at least one of a first and a second sequence by at least one of a first and a second marking engine, which step of scheduling includes: selecting at least a portion of each front and back image, comparing corresponding selected portions of the front and back images, and based on the comparison, scheduling the front and back images for printing with one of the first and second sequence.