1964 model was the 182G (s/n 18255059-18255844 -- some 1965 model 182Hs were built in calendar year 1964, as well). 182K was the 1967 model (s/n 18257626-18258505). Major differences between the two were the 182K's updated instrument panel, one-piece windshield and restyled cowl and spinner.
When new they were very capable, comfortable airplanes. The 182 is the third-most-popular lightplane ever built (behind C-172 and C-150/152), so it had a lot going for it. 55 years later, however, it's safe to say that no two airplanes are exactly alike, even if they came off the same production line. Each individual airplane should be judged on its own merits for equipment, condition, general TLC, history, etc., etc.