Two very different things.
Constitutional review (similar to judicial review) is the power of the Supreme Court to review laws or other acts of government to ensure they are in line with the Constitution. Since the Constitution is the highest law of the land and trumps everything else, if a law conflicts with the Constitution, then they _law_ is invalidated.
Constitutional amendments are how we change the Constitution itself. If some part of the Constitution needs to be changed, repealed or updated we have a very structured process to have that change made. Once the process is complete, this change becomes part of the Constitution and is treated like any other part of the Constitution (in terms of legal supremecy).
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