The litre is defined as being equal to 0.001 cubic metre. Note that the statement is a definition. The 0.001 cubic metre is 1,000 cubic centimeters (cc's), so a litre is equal to 1,000 (or 103) cc's....
One. They are identical volumes.
One. The milliliter (mL) and the cubic centimeter (cc or cm3) are identical.
1 cc = 1 ml = volume of 1 gm water
The milliliter and the cubic centimeter are equal volumes.