I assume you mean a sentence like this. Tom is tall, compared to his brother. You can't say ''compare to' here.
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What is the difference between compare to and compared to then?
AnonymousWhat is the difference between compare to and compared to then?
You can't use "compare to" in the context you presented in your first post.
You compare something to something else, but you can't say something has a certain property "compare to" something else. In the latter case it has to be "compared to" something else".