The entire armor is asymmetrical, meaning left and right limbs and even other armor sections differ in length and even design. Ex. left and right arm lengths are different, same with the legs.
Unless you need or want to cut it to match you can leave it as is and it's perfectly acceptable at all levels of approval.
As for the lower shins you can trim the same length, on both inner and outer if you wish. It doesn't have to be perfect