What is the difference between "6383 700 7520" and "6383 700 7521"? Can you provide the overall cable lengths and the plastic sleeve lengths?

Both Cables differ in size! Here are the measurements below 6383 700 7520 - Overall cable length (same as inner cable length) - 1620mm; Outer cable length - 1310mm; Sleeve length - 28mm 6383 700 7521 - Overall cable length (same as inner cable length) - 1330mm; Outer cable length - 1070mm; Sleeve length - 28mm