I had looked at the instruction sheets before posting. I did notice the yellow kit had the same sheet as the green kit, right down to the kit number. But there is a different kit number for each kit and there is a difference in the number of parts in each kit. The green has 120 parts and the yellow has 128 parts. Probably nothing significantly different to make owning one over the other anything to really consider. Being a huge Mustang fan, I was just wondering if there were some extra goodies in the yellow kit vs. the green. Thanks for the help.