Slide 14 of 15
Compare the two: Griffey played more, Cameron had more 2B and 3B in fewer AB, but far fewer HR. Griffey better in BA, OBP, and esp SLG.
Left side of second chart is actual team data. Note they are close.
Right side shows differences generated by model (not compared to actual). Seattle loses less than Cinci gains due to getting Hunter (0.280 OBP) out of lead-off spot.
Trade effect is about +/- 3 wins a season