The Cub 1862 was produced about 12 years ago. It uses a twin opposed Kohler engine. I have no knoweldge of either the 1861 or 1863, however the 1864 was virtually identical to the 1862, however it used a V-twin Kohler. It is my understanding both the 1862 and the 1864 were 18hp.
EDIT: The 1862 has a hydrostatic transmission, electric PTO switch, power steering, and hydraulically controlled lift cylinders to lift the mower deck, snow blower, etc.