Call these guys - http://mmerlinn.com/catalog/lilscrib...6/gm9l6010.htm
. I think you can more easily tell by sharing with us the RPO code for the transmission. These codes are often located in the glove box. M30 would be the RPO code for a 4L60E and MT1 would be the RPO code for the 4L80. Any GM dealer can tell you which transmission you have by providing them with the last 8 digits in your VIN.
The 24201073, PWM - stamped on your existing transmission part is the Pump Body. I don't know if this is unique to a 4L60E but pursuant to the website above it is common on the 4L60E.