They are not at all the same. In fact, even heartfelt change of mind does not equal true repentance. We are petulant, fickle, self-involved, ignorant, rebellious and at the core, evil, but for God's work in us to change us. The only true repentance is a gift from God. Submission is a good way to tell the difference, and that, by evidences, not by feelings, as it is also concerning obedience. See Romans 8: "7 The mind governed by the flesh is hostile to God; it does not submit to God’s law, nor can it do so. 8 Those who are in the realm of the flesh cannot please God."
Curiously, in the Greek, the notion of repentance is not the same thing as it is in the English. Understanding that we are but man, God speaks of repenting in terms of continuous action. We do indeed repent, done and done, but we also continue to live in repentance, if repentance is real. And that is something that only God can produce in us. If it is so, it is established so by God, and "kept" by God, but we still remain responsible to commit to it.