It has a different drip tray setup, a smaller but deeper water pan that slides into a pair of rails under an opening in the drip pan, vented on left side versus the top, different location for the door hinges, 1200 watt element in the 40" model (though that may have been there before), control panel moved from lump on top to front panel, LED lights moved to outside of box versus inside on older model, chip tray redesign (retrofit kit will allow change to new style from older versions), removal of rails under chip tray/cover (not necessary in new model), easier access to element for replacement (this my have been done on earlier versions and carried forward), and a blue panel display. I hope I got everything but if I didn't let me know.