Product review (5 stars): The $80 ice maker is the original equipment, the $40 is not.
The $80 ice maker is THE ORIGINAL FACTORY Teflon like coated ice tray and its worth the $80 over the $40 models you can find.  Ive had this Kenmore refrigator since 1995 and the ice maker began loosing its ice tray coating at about 2010.  I replaced the factory unit with one of the $40 unit and was surprised to find the ice cube tray was not the original Teflon but what appeared to be a thick white paint.  It worked for about 18 months but I started noticing flakes in my ice which I eventually determined to be paint and metal.  Its a good quality product if thats what you're looking for and I believe it to be a OEM direct replacement.