I asked the exact same question in my own thread a while ago. Everyone basically said they are the same, they just want the "Escalade" to make the most power because its a flagship vehicle, like the Corvette wont ever be out powered by a Camaro.
I bought the L76 intake, throttle body, fuel rails, injectors, MAP sensor, etc for $530 from Scoggin way back when also. I thought it was too good to be true, and apparently it was if you cant find it anymore! Edit:
I found the thread for you too look at if you want... http://www.ls1tech.com/forums/genera...alade-l92.html