A:Answer theCase, There are slight differences between model AGC6540KFS and WCG51US0DS.
The cooktop surface material is Stainless/Porcelain Coated Steel.
On model AGC6540KFS, the knobs are black on stainless. While both cooktops have 4 burners, this model has a 5,000 BTU Left Front burner (which is a Simmer burner), 12,000 BTU Left Rear SpeedHeat Burner, 9,100 BTU Right Front Sealed Burner, and a 12,000 BTU Right Rear Sealed Burner. There are two grates that are Cast Iron and have a gloss finish. This model Cooktop is Height, Side, and Front ADA Compliant.
With model WCG51US0DS, the knobs on stainless steel models are stainless steel. This model has a 5,000 BTU Left Front burner (which is a Simmer burner), 15,000 BTU Left Rear SpeedHeat Burner, 9,100 BTU Right Front Sealed Burner, and a 12,000 BTU Right Rear Sealed Burner. There are two grates that are Cast Iron and have a Matte finish. This model Cooktop is Height, and Side Reach ADA Compliant.
In addition, information on the cutout requirements for both cook-tops are the same and can be found in the installation instructions beginning on page 4, http://bit.ly/2Cgxi9p.