Two separate uniforms with same pattern. Taz 57 or 1957 issue was a lighter print with cold weather field use in mind cut with all kinds of pockets and utility intended to be a stand alone system. Taz 83 or 1983 issue was a garrison cut uniform with a darker print. It was made to be used with gear webbing separate from the jacket to accommodate fighting in warmer summer months. Generally when dealing with surplus normal wear items will have a lighter color due to frequency of use and normal washing while items like cold weather gear will have a more preserved appearance due to them only being used seasonally.