According to the information provided by the manufacturer, the two Hamilton Beach models possess identical sets of functions and differ only in size. Hamilton Beach 49980A measures 12.5" H x 10" W x 15 "D, while Hamilton Beach 49980Z is 13.9” H x 12.23” W x 11.08” D. This makes the 49980Z more suitable for narrow counter spaces since its body is also narrower, compensating for the reduced depth and width dimensions with its increased height. The 49980A, on the other hand, is shorter and wider, making it ideal for small under-cabinet spaces.