BRENNAN - Yes there is....actually pretty easy to understand. The first Cub Cadet, made in 1961,'62, &'63 are referred to as "Originals" or simply "Cub Cadets" The 70 & 100 was next, similar, almost identicle tractors except for 7 or 10 HP engines. Next was 71,102, 122, 123. 71 was 7 HP gear drive, 102 & 122 10 & 12 HP GD, 123 was 12 HP hydro, the first Hydro CC. Next was 72/104/105/124/125; 7HP GD, 10HP GD, 10HP Hydro, 12HP GD, 12HP Hydro. Next was 73/106/107/126/127/147. Same thing, 7HP GD, etc. etc plus a new 14 HP Hydro added to the line. Next was 86/108/109/128/129/149/169. Wide Frames, room for bigger engines, so the 7 HP became a 8 HP GD, plus a new bigger 16 HP Hydro added. Next was 800/1000/1200/1250/1450/1650 Quiet Lines. XX00 = GD, XX50= Hydro, first numbers are HP,8,10,12,14,16.
Next are 1282,482,582,682,782&982. This gets harder, 1282 was 12HP Hydro, 482 was 11HP GD, 582 was 16 HP GD, 682 & 782 were 17HP Hydro, but 782 had hyd. lift. 982 was 19.9 HP hydro.
With this info and the chart on the home page of this forum You should be able to figure out the relative ages and features of different model CC's.