Small Engines (Lawn Mowers, etc.): Toro S-200 &S-620, exact model, s200

Question
What is the difference between these models? And what is the engine size of each.

Answer
First thing is age.  The S200 is older. To se how much I need the exact model and serial.  I think that another difference is the auger one straight and one curved. Curved is better.  Go to the Toro website at www.toro.con maneuver to the customer care page and then to the product center.  Enter the model and serial and all the information you want will come up.