由OG-141想到的限定性与非限定性定语从句的思考

141. Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.

(A)  Unlike transplants between identical twins, whose genetic endowment is the same

(B)  Besides transplants involving identical twins
                with the same genetic endowment

(C)  Unless the transplant involves identical twins
                who have the same genetic endowment

(D)  Aside from a transplant between identical twins with the same genetic endowment

        (E) Other than transplants between identical twins,
            whose genetic endowment is the same

此题选C，无异议。我想请教的是关于with the same genetic endowment和who have the same genetic endowment的区别，我知道前者强调的是一部分twins而非所有twins,正如OG所说：the expression identical twins with the same genetic endowment wrongly suggests that only some identical twin pairs are genetically identical. 而这个道理与that和which所指的限定性和非限定性从句的作用有关系吗？哪位大侠能帮忙理顺一下这个知识点？谢谢

顶个先

期待指点

好，谢谢！

弱弱的问一下，

那E为什么不行呢？

谢谢