Exactly the same with the terminally ill who have deteriorated to a vegetative state.
The Catholic Church does not demand that people be kept alive by extraordinary means. It also teaches that the terminally ill should be kept as comfortable as possible through the death process ( this includes hydration and nutrition.) This is a very humane and compassionate position to take whether or not they happen to be in a vegetative state.
Are you advocating deliberately killing the terminally ill who may be in a vegetative state? If you are, I can see how this is compatible with someone who as no problem with perpetually freezing and denying a human embryo its basic human rights to life, liberty, and pursuit of happiness.